Sproutback Trudge is a rare Creature — Fungus Beast card from Commander 2021 (C21), collector number 68. Current market price: $0.49, TCGplayer market prices via Scryfall.
This spell costs {X} less to cast, where X is the amount of life you gained this turn. Trample At the beginning of your end step, if you gained life this turn, you may cast this creature from your graveyard.