Jon Irenicus, Shattered One is a rare Legendary Creature — Elf Wizard card from Battle for Baldur's Gate Promos (PCLB), collector number 278s. Current market price: — (foil $1.73), TCGplayer market prices via Scryfall.
At the beginning of your end step, target opponent gains control of up to one target creature you control. Put two +1/+1 counters on it and tap it. It's goaded for the rest of the game and it gains "This creature can't be sacrificed." (It attacks each combat if able and attacks a player other than you if able.) Whenever a creature you own but don't control attacks, you draw a card.