The Unforgiving

Shroud, Trample, Reach, Protection from
Multicolored spells.
As long as you control no other legendary
creatures, The Unforgiving gains Indestructible,
Infect, and Protection from Instants.
Whenever The Unforgiving leaves the battlefield,
return all creatures from each players graveyard
to your side of the battlefield tapped and
attacking their controller.