ziranathus, warden of life

ascend {w}{b}{r}{g} (put 4 +1/+1 counters on this creature, you may only use this ability once).
indestructible, vigilance
when you ascend ziranathus, warden of life put 2
+1/+1 counters on all creatures you control and
give each creature an opponent controls 2 -1/-1
counters.
at the beginning of your upkeep you may put up
to x creatures from your graveyard into the
battlefield where x is the number of creatures
in all opponents graveyards.