Groxx, Hydra Lord

Multikicker {b/g} (You may pay an additional {b/g} any number of times as you cast this spell.)
Regrowth (At the beginning of your upkeep, put a
number of +1/+1 counters on this creature equal to the amount of damage it has taken this turn. It must
survive the damage to get the counters.)
Groxx, Hydra Lord enters the battlefield with a
+1/+1 counter on it for each time it was kicked.