Rebec, Slime Mind Link

Rebec, Slime Mind link comes with two +1/+1 counters.
Whenever an Ooze creature enters the battlefield
you may pay {g/u}{g/u} if you do put a slime counter
on target creature an opponent controls.
{b/g}{b/g}: Exile target creature with a slime counter
on it and put a +1/+1 counter on Rebec, Slime
Mind Link.