Annex Sentry is a rare Artifact Creature — Phyrexian Cleric card from Store Championships (SCH), collector number 7. Current market price: $0.36, TCGplayer market prices via Scryfall.
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) When this creature enters, exile target artifact or creature an opponent controls with mana value 3 or less until this creature leaves the battlefield.