Riki, the Undying

Flying, lifelink
{x}{t}, Return a creature card from your graveyard to the battlefield with converted mana cost X, put a
+1 +1 counter on it and lose X life.
Bestow {p/b}{p/b}{p/b}{p/b}: When enchanted creature dies, return it to the battlefield with a +1 +1 counter
on it. This ability can only be cast when
Riki, the Undying is in the graveyard.