Mistbreath Elder is a rare Creature — Frog Warrior card from Bloomburrow (BLB), collector number 184. Current market price: $0.32 (foil $0.39), 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.