Ichormoon Gauntlet is a mythic Artifact card from Phyrexia: All Will Be One Promos (PONE), collector number 56p. Current market price: $15.57 (foil $26.82), TCGplayer market prices via Scryfall.
Planeswalkers you control have "[0]: Proliferate" and "[−12]: Take an extra turn after this one." Whenever you cast a noncreature spell, choose a counter on target permanent. Put an additional counter of that kind on that permanent.