Invoke The Arcana

Hexproof When you cast a spell from hand with a mana cost of 1 or greater, put an Arcana Counter on Invoke The Arcana. {T}, Remove 21 Arcana Counters from Invoke the Arcana: Tap any number of creatures you choose. Until end of turn, you can cast spells from your hand without paying their mana cost. Exile Invoke The Arcana at end of turn.