Defiler of Vigor is a rare Creature — Phyrexian Wurm card from Dominaria United Promos (PDMU), collector number 160p. Current market price: $4.54 (foil $3.46), TCGplayer market prices via Scryfall.
Trample As an additional cost to cast green permanent spells, you may pay 2 life. Those spells cost {G} less to cast if you paid life this way. This effect reduces only the amount of green mana you pay. Whenever you cast a green permanent spell, put a +1/+1 counter on each creature you control.