Oros, Guardian of Finality

Deathtouch, Lifelink
Harvest (When this creature attacks you may sacrifice
a nonland permanent and this creature gets +X/+X
until end of turn, where X is equal to the sacrificed permanents converted mana cost.)
"Beings long forgotten, to us they where only myths and legends taught to us as children. Now these myths walk among Keres once again." - Citizen of Keres