Deification is a rare Enchantment card from March of the Machine: The Aftermath (MAT), collector number 52. Current market price: $1.96 (foil $1.04), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a planeswalker type. Planeswalkers you control of the chosen type have hexproof. As long as you control a creature, if damage dealt to a planeswalker you control of the chosen type would result in all loyalty counters on it being removed, instead all but one of those counters are removed.