Yevah, the Slimeomancer

Evolve

{1}{u}, Remove two +1/+1 counters from among creatures you control: Draw a card.

{b}, {t}, Remove X +1/+1 counters from among creatures you control: Put X -1/-1 counters on target creature you don't control.

{2}{g}: Put a +1/+1 counter on target creature you control.