Hydroid Ooze

You may pay {x}{g}{g} rather than the mana cost
for Hydroid Ooze. If you do, it is a 2/2 that enters
with X +1/+1 counters instead.
Hydroid Ooze can't be countered.
Trample.
When Hydroid Ooze dies, create two 0/0 green
hydra ooze tokens. They enter the battlefield with
X +1/+1 counters, where X is half Hydroid Ooze's
power, rounded down.