When Thragtusk enters the battlefield, you gain 5 life.
When Thragtusk leaves the battlefield, put a 3/3 green Beast creature token onto the battlefield.
This Value-Beast was a major player Standard, fueling Naya-Pod as well as any deck that could splash Green. It overshadowed other stompy Green creatures at the time, like Wolfir Silverheart, and was one of the most popular things to flicker with Restoration Angel. It still sees some play in Legacy in Nic Fit decks, and occasionally takes a sideboard slot in Modern.