Elusive Krasis is a uncommon Creature — Fish Mutant card from RNA Guild Kit (GK2), collector number 116. Current market price: $0.26, TCGplayer market prices via Scryfall.
This creature can't be blocked. 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.)