TLDR
Modern is a nonrotating, one-on-one Constructed Magic format. A Modern deck contains at least 60 cards, may have a sideboard of up to 15 cards, and normally follows a four-copy limit across the main deck and sideboard. Its card pool begins with Eighth Edition and Mirrodin, then includes cards from later releases designated as Modern-legal. Cards do not leave through scheduled rotation, but individual cards can be banned. Always check Wizards’ live format and banned-list pages before registering a deck.
For anyone searching for the MTG modern format explained in plain English, the central distinction is simple: Modern has a large, persistent card pool, but it is not an unrestricted collection of every Magic card ever printed. Sets and cards must enter the format through a Modern-legal release, and the format maintains its own banned list.
That makes Modern easier to understand if you separate three questions: Is the card part of the Modern card pool? Is it currently banned? Does your deck satisfy the Constructed deckbuilding rules? A card must clear all three checks before it belongs in a legal Modern deck.
MTG Modern format explained at a glance
| Rule | Modern requirement |
|---|---|
| Style of play | One-on-one Constructed |
| Main deck | At least 60 cards |
| Sideboard | Optional, with up to 15 cards |
| Copy limit | Normally four cards with the same English name across the deck and sideboard |
| Card pool | Begins with Eighth Edition and Mirrodin, plus eligible later releases |
| Rotation | No scheduled set rotation |
| Banned cards | Format-specific list maintained by Wizards |
Wizards describes Modern as a nonrotating Constructed format for one-on-one play, with 60-card decks and sideboards of up to 15 cards. The official Modern format overview is the best starting point for checking the format’s structure and card pool.
“Constructed” means that players prepare their decks before playing instead of building from cards opened or drafted during an event. If that distinction is unfamiliar, this guide to Constructed versus Limited in Magic explains how the deckbuilding process and available card pool change.
How to build a legal Modern deck
A Modern main deck must contain at least 60 cards. There is no general maximum deck size, but a player must be able to shuffle the deck without assistance. In practice, most deckbuilders stay at 60 because adding extra cards makes drawing a particular card less consistent.
You may also bring an optional sideboard containing up to 15 cards. The sideboard is a separate group of cards that can modify the deck between games in a match. You do not need one for casual single-game play, but it is part of normal match preparation.
The ordinary copy limit is four cards with the same English name across the main deck and sideboard combined. Four copies in the main deck therefore leave no room for another copy in the sideboard. Basic lands are exempt, and an individual card’s rules text can create an exception. The tournament rules define these general Constructed requirements.
Remember that “four copies” concerns the card’s name, not its artwork, frame, set symbol, language, or collector number. Two visually different printings with the same English card name count toward the same limit. Players still need to watch for card backs, sleeves, wear, or other visible differences that could make cards identifiable in a tournament deck.
Why Modern does not rotate
Modern is nonrotating. A normal set rotation does not periodically remove older groups of cards from the format, so a card does not become illegal merely because it has been in Modern for several years. That is the major structural difference between Modern and rotating formats such as Standard.
Nonrotating does not mean unchanging. New Modern-legal releases can add cards to the pool, and Wizards can ban or unban individual cards. Oracle wording, tournament policy, and game rules can also be updated. The enduring feature is the absence of a scheduled rotation that removes whole blocks of older sets.
This distinction matters when returning to an old deck. Its cards have not automatically expired, but the deck should not be assumed legal without checking it. A key card may have been banned, while a newly released card may now offer another option. Treat nonrotation as persistence, not a guarantee that every decklist remains legal forever.
Which cards are legal in Modern?
Modern’s pool begins with Eighth Edition and Mirrodin and includes eligible cards from later releases, subject to the format’s restrictions. That starting point is why the word “Modern” can be slightly misleading: it refers to a defined format card pool, not simply any card that looks recent or uses a modern-style frame.
Release eligibility matters more than the physical appearance of a card. Not every supplemental Magic product automatically adds its cards to Modern. Conversely, some releases are specifically designed to introduce cards directly into the format. The safest approach is to check the card or release against Wizards’ current Modern information rather than inferring legality from the date, border, artwork, or product name.
Set symbols identify printings, but they do not independently decide whether a particular copy can be played. If you are trying to identify the version in front of you, see how MTG set symbols and rarity marks work. Legality is a separate question.
Older printings of legal cards are allowed
Suppose a card was originally printed before Modern’s starting point and was later reprinted in a Modern-legal set. The older physical printing can be used because a card with the same name exists in the legal card pool. You do not have to replace it with the newer printing merely to get the later set symbol.
This same-name rule prevents legality from depending on which edition of an otherwise identical card a player owns. When wording has changed between printings, however, the card uses its current Oracle text rather than whatever wording happens to be printed on the older copy. Knowing how to read a Magic card and distinguish printed text from Oracle wording is useful when older templates are involved.
How to check a card’s Modern legality
Use a short verification process instead of relying on a remembered decklist or an old article:
- Confirm that the card appears in a release eligible for Modern, or has the same English name as a card that does.
- Check the current official Banned & Restricted list to make sure the card is not banned in Modern.
- Count copies across the main deck and sideboard, applying the normal four-copy rule and any relevant exception.
- Before a sanctioned event, review the organizer’s information and the current tournament rules for registration or card-use requirements.
Do not use a static banned-card list as your final check. Ban and unban decisions are date-sensitive, and a card can have different status in different formats. “Banned in Modern” means it cannot be included in a Modern deck; it does not automatically describe that card’s legality in Standard, Commander, Legacy, or another format.
Modern compared with Standard and Commander
Modern and Standard are both Constructed formats, but their card pools behave differently. Standard uses a smaller pool that changes through rotation, while Modern retains its eligible older releases unless individual cards are banned. A Standard-legal card is not necessarily the only kind of card available in Modern, and legality in one format should never be treated as proof of legality in the other.
Commander differs more fundamentally. Modern is built around one-on-one play, at least 60 cards, and the ordinary four-copy rule. Commander uses a different deck structure centered on a commander and singleton construction, with exceptions. A legal Commander deck should not be assumed legal in Modern, even if many individual cards overlap between the formats.
Can you use proxies in Modern?
The answer depends on whether “Modern” means a casual game using Modern deckbuilding rules or a sanctioned tournament. A casual group or store can establish its own expectations for transparent MTG proxies and playtest cards. Ask before arriving with them, especially when joining an established league or unfamiliar playgroup.
Sanctioned events follow stricter requirements. The Magic Tournament Rules generally require genuine, regulation-sized Magic cards publicly released by Wizards. Tournament proxies are limited judge-issued substitutes used in specified situations, such as when a card becomes damaged during an event; bringing an unofficial replacement from home does not make it a tournament proxy under that policy.
In short, a playtest card may be acceptable for testing a Modern deck when the people involved agree, but it should not be assumed acceptable at a sanctioned Modern event. Confirm the event type and organizer’s instructions before playing.
Common Modern questions
Does Modern rotate?
No. Modern has no scheduled set rotation. Its card pool grows through eligible releases, while bans and unbans can change which individual cards may be played.
Do I need exactly 60 cards?
You need at least 60 cards in the main deck. Sixty is the usual choice because it avoids reducing the chance of drawing the deck’s most important cards.
Is a sideboard required?
No. A sideboard is optional and can contain up to 15 cards. It becomes especially relevant when playing multi-game matches.
Can I use an old-border printing?
Usually, yes, if a card with the same English name is in the Modern card pool and the card is not banned. The printing itself does not need to carry the set symbol of the release that made the card legal. Its current Oracle text still applies.
Where can I find every card currently banned in Modern?
Use Wizards’ live Banned & Restricted page rather than a copied list. That avoids turning a dated snapshot into an apparently permanent answer.
The practical Modern legality test
Modern is best understood as a nonrotating but actively maintained format. Start with a main deck of at least 60 cards, keep the optional sideboard at 15 cards or fewer, and observe the normal four-copy limit. Then verify that every card entered through a Modern-legal release and is absent from the current Modern banned list.
The crucial distinction is that nonrotation preserves the card pool; it does not freeze the format. Check release eligibility, the live banned list, and current event rules before registering a deck, and you will avoid most Modern legality mistakes.