Ichormoon Gauntlet is a mythic Artifact card from Phyrexia: All Will Be One (ONE), collector number 56. Current market price: $32.68 (foil $36.29), 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.