Bloodvial Purveyor

“Flying, trample <br> Whenever an opponent casts a spell, that player creates a Blood token. <em>(It's an artifact with "1, T, Discard a card, Sacrifice this artifact: Draw a card.")</em> <br> Whenever Bloodvial Purveyor attacks, it gets +1/+0 <span style="color:red">until end of turn</span> for each Blood token defending player controls. <br> <br>This card has received an errata which is displayed in red.”