Toofer, Keeper of the Full Grip is a rare Legendary Creature — Human Gamer card from Mystery Booster 2 (MB2), collector number 554. Current market price: $0.22, TCGplayer market prices via Scryfall.
Whenever a spell you control causes you to gain card advantage, each opponent loses 2 life. (You gain card advantage each time a spell you control resolves and you end up having more cards relative to your opponents than before that spell resolved. Divination, Annihilate, and Wrath of God can all be card advantage. And remember: tokens aren't cards!)