Balefang the Unslayable

Flying, trample, protection from Angels and from Archons

Players can't gain life.

When Balefang enters, target opponent creates a tapped Baneslayer Angel token. The token is goaded for the rest of the game. (It's a {3}{W}{W} 5/5 Angel creature with flying, first strike, lifelink, and protection from Demons and from Dragons.)