What are the abilities of Bloodvial Purveyor?
user
Flying, trample\nWhenever an opponent casts a spell, that player creates a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this artifact: Draw a card.")\nWhenever Bloodvial Purveyor attacks, it gets +1/+0 until end of turn for each Blood token defending player controls.
assistant