Mossborn Hydra is a rare Creature — Elemental Hydra card from Foundations (FDN), collector number 107. Current market price: $14.09 (foil $13.45), TCGplayer market prices via Scryfall.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) This creature enters with a +1/+1 counter on it. Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.