Deravas, of Life and Death

Vigilance, Deathtouch, Lifelink
When Deravas enters the battlefield, put a creature card from a graveyard onto the battlefield under your control.
If damage would be dealt to a creature you control, if that creature would survive, prevent that damage instead.
Whenever another creature dies, you gain life equal to that creatures power and each opponent loses life equal to that creatures toughness.