Phyrexian Devourer is a rare Artifact Creature — Phyrexian Construct card from Alliances (ALL), collector number 125. Current market price: $32.28, TCGplayer market prices via Scryfall.
When this creature's power is 7 or greater, sacrifice it. Exile the top card of your library: Put X +1/+1 counters on this creature, where X is the exiled card's mana value.