Ixidron is a rare Creature — Illusion card from Commander 2014 (C14), collector number 116. Current market price: $0.41, TCGplayer market prices via Scryfall.
As this creature enters, turn all other nontoken creatures face down. (They're 2/2 creatures.) Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.