Visceral Intuition

Fading 4
Pay 1 life, Sacrifice a creature: Add X mana
in any combination of {b} and/or {g}, where
X is the sacrificed creature's converted mana
cost. Put a -1/-1 counter on each creature.
When a creature dies, its owner may pay X to
put that creature on to the battlefield, where X
is the number of time counters on Visceral
Intuition.
"I die, therefore I am."