Bug
found what I believe to be a bug in alchemy. opponent swung at me with Bloodvial Purveyor, I had 3 blood tokens so I sacrificed one, I blocked with Iymrith, Desert Doom that had a +1+1 counter on it, my opponent cast (cant find the name of the spell) it cost GB instant speed, target creature gains trample, and when it dies return it to the battlefield tapped and you gain 2 life. for some reason the game acted as though I hadnt blocked.
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[Deleted User] commented
Bloodvial Purveyor already has trample. The spell you are describing sounds like Infuse with Vitality. Deathtouch and Trample will mean the attacking creature will only need to assign 1 damage to blocking creatures, and the rest will trample over