15x Magic: The Gathering cards
When this enchantment leaves the battlefield, that creature's controller sacrifices it
It follows, then, that protection from everything is profoundly powerful, as it means "this card can't be blocked, targeted, enchanted, or damaged by anything." A Creature with protection from everything can't be blocked, can't be targeted by Lightning Bolt or Slice from the Shadows, and can't be locked down by a Pacifism or Icy Manipulator
I've cast it quite a few times (albeit in highly flawed and experimental decks) and it always felt really good despite the fact that it was in decks that were kind of zany
You were gonna be Vandalblasted or Austere Commanded, or even just picked off bit by bit by a rogue Reclamation Sage