Yavera, the Slimeomancer

Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put
a +1/+1 counter on this creature.)

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

{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