Mondrak, Glory Dominus is a mythic Legendary Creature — Phyrexian Horror card from Phyrexia: All Will Be One Promos (PONE), collector number 23p. Current market price: $44.77 (foil $42.40), TCGplayer market prices via Scryfall.
If one or more tokens would be created under your control, twice that many of those tokens are created instead. {1}{W/P}{W/P}, Sacrifice two other artifacts and/or creatures: Put an indestructible counter on Mondrak. ({W/P} can be paid with either {W} or 2 life.)