Wulfrun, God of the Full Moon

Trample

Whenever a creature you control becomes blocked, it gets +X/+X until end of turn, where X is that creature's power.

Sacrifice a creature: Wulfrun, the Wolf God becomes indestructible until end of turn.

If Wulfrun, the Wolf God would die, exile it instead, then return it to the battlefield under your control at the beginning of the next upkeep.