Walker, Angel of Mourning

Flying, Lifelink, Vigilance
When another creature you control dies, put a
+1/+1 counter on Walker, Angel of Mourning
When Walker, Angel of Mourning dies, search
your library and graveyard for a creature
or planeswalker card with converted mana cost
X or less, where X is the number of
+1/+1 counters on Walker, Angel of Mourning
and put it onto the battlefield