Bloodvial Purveyor

Innistrad: Crimson Vow · #290 · Rare

Creature — Vampire

Flying, trample Whenever an opponent casts a spell, that player creates a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.") Whenever this creature attacks, it gets +1/+0 until end of turn for each Blood token defending player controls.