Thorna and Twigtooth is a rare Legendary Creature — Giant Treefolk card from Alchemy: Lorwyn Eclipsed (YECL), collector number 27.
Thorna and Twigtooth enters with two -1/-1 counters on it. Whenever Thorna and Twigtooth attacks, remove all counters from target creature you control. Each opponent loses X life, you gain X life, and the topmost creature card in your library perpetually gets +X/+X, where X is the number of counters removed this way.