Eligma, The Exiled Fiend

Trample, First Strike
{b}{b}{p/r}{p/r}: Each player sacrifices a creature.
Eligma gets +X/+X until end of turn, where X
is the combined power of all creatures sacrificed
this way. Activate once per turn as a sorcery.
If Eligma would die, instead transform Eligma
into Wandering Stranger and then exile
Wandering Stranger.