Phyrexian Devourer

Phyrexian Devourer

Artifact Creature - Phyrexian Construct | Power/Toughness: 1 / 1 (CMC 6)
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.