Scurry Oak is a uncommon Creature — Treefolk card from The List (PLST), collector number MH2-172. Current market price: $2.64, TCGplayer market prices via Scryfall.
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.) Whenever one or more +1/+1 counters are put on this creature, you may create a 1/1 green Squirrel creature token.