Deification - March of the Machine: The Aftermath - 52

Enchantment

Mana Cost: {1}{W}

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.

Rare · March of the Machine: The Aftermath · #52 (MAT)

Illustrated by Jason A. Engle