A banned card cannot be included in a deck or sideboard for that format. A restricted card is limited to one total copy across both. Here is why the distinction matters in Vintage, Timeless, and format-specific legality checks.
Modern is a nonrotating, one-on-one Constructed format with a card pool beginning at Eighth Edition and Mirrodin. Here is how deck construction, legality, bans, reprints, and tournament proxy rules work.
Constructed decks are prepared before play from a format-defined card pool. Limited decks are built at the event from cards opened or selected there. Here is what that changes.