Constructed formats
Decks built in advance from your collection. Most require at least 60 cards and up to 4 copies per card (except basic lands).
Min. cards60
Copies per cardmax 4
Sideboardup to 15
RotationAnnual (~Autumn)
Rules
- Card pool: sets from the last ~3 years (currently through Wilds of Eldraine).
- No rotation planned in 2026; next rotation in 2027.
- Limit of 4 copies per card (except basic lands).
- Banned list maintained by Wizards of the Coast.
- Sideboard: the 4-copy limit applies to main deck + sideboard combined.
Casual / Commander formats
Limited formats
Decks built only from cards opened or drafted at the event. Closed pool — you cannot trade cards with other players.
Digital formats (MTG Arena)
Universal rules (all MTG Constructed formats)
- Conspiracy cards: this special card type is always banned in competitive formats.
- "Ante" mechanics: cards with ante mechanics are banned in all official formats.
- Offensive cards: cards removed by Wizards of the Coast for being offensive are universally banned.
- Stickers or Attraction cards: only legal in formats that explicitly support them.
- Color identity (Commander formats): includes mana symbols in the card's rules text, not just the mana cost.
The Odhinbox deck validator applies these rules automatically when checking a deck.