Mistbreath Elder is a rare Creature — Frog Warrior card from Bloomburrow Promos (PBLB), collector number 184p. Current market price: $0.65 (foil $0.97), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, return another creature you control to its owner's hand. If you do, put a +1/+1 counter on this creature. Otherwise, you may return this creature to its owner's hand.