Valley Mightcaller is a rare Creature — Frog Warrior card from Bloomburrow Promos (PBLB), collector number 202p. Current market price: $1.15 (foil $1.83), TCGplayer market prices via Scryfall.
Trample Whenever another Frog, Rabbit, Raccoon, or Squirrel you control enters, put a +1/+1 counter on this creature.