Rot-Curse Rakshasa is a mythic Creature — Demon card from Tarkir: Dragonstorm Promos (PTDM), collector number 87p. Current market price: $1.71 (foil $2.34), TCGplayer market prices via Scryfall.
Trample Decayed (This creature can't block. When it attacks, sacrifice it at end of combat.) Renew — {X}{B}{B}, Exile this card from your graveyard: Put a decayed counter on each of X target creatures. Activate only as a sorcery.