Force of Nature is a rare Creature — Elemental card from Beatdown Box Set (BTD), collector number 56. Current market price: $1.31, TCGplayer market prices via Scryfall.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) At the beginning of your upkeep, this creature deals 8 damage to you unless you pay {G}{G}{G}{G}.