Elora, Simic Biomaster

{g}{u}, {t}: Remove X +1/+1 counters from Elora, Simic Biomaster, put X 1/1 green and blue mutant druid creature tokens with "{t}: Add {g} or {u} to your mana pool" onto the battlefield.
Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)