FLKR

{r}{r}{t}: Target creature gains 2 +1/+1 counters until the end of the turn.
{t}: Tap 3 creatures you control. If you do so, destroy target nonland permanent.
Bioresonant (When casting this spell, you may choose to remove +1/+1 counters from creatures you control. For each +1/+1 counter so removed, reduce the mana cost of this casting by 1.)