Phyrexian Devourer
Artifact Creature — Phyrexian Construct
When Phyrexian Devourer's power is 7 or greater, sacrifice it.
Exile the top card of your library: Put X +1/+1 counters on Phyrexian Devourer, where X is the exiled card's mana value.
Power/Toughness: 1/1