19

This happened this weekend, and we were unsure how to resolve it.

Opponent casts Progenitus. On my turn, I cast Polymorphist Jest. Then I cast, Darksteel Mutation targeting the Progenitus.

Normally, I could not target the Progenitus because it has Protection from Everything, but since it lost all abilities and became a frog, it was a valid target (We thought so anyway). It was at the end of this turn that we were unsure. Polymorphist's Jest effect ended, but the Darksteel Mutation was still enchanting the creature. This is what we thought:

  1. Progentius has Protection from Everything and the Enchantment "falls off" as it is no longer a valid target.
  2. The Insect has no abilities apart from Indestructible, and the Enchantment stays.
  3. Something Else???

I'm really hoping this is #2 since this combo would allow for targeting of things with shroud and hexproof, etc. on the turn I cast Polymorphist's Jest.

  • 2
    Incidentally, shroud/hexproof only care about targeting the creature with the aura; they don't make auras fall off like protection does. This is useful if the aura doesn't have the "loses all abilities" clause that Darksteel Mutation has. – Michael Snook Jan 5 '15 at 18:41
16

Choice number 2 is the correct one: the Progenitus is an Insect with no abilities except Indestructible and the Aura stays attached to it. Rule 613.1 says

The values of an object's characteristics are determined by starting with the actual object. For a card, that means the values of the characteristics printed on that card. For a token or a copy of a spell or card, that means the values of the characteristics defined by the effect that created it. Then all applicable continuous effects are applied in a series of layers

The key point is that determining the values of an objects characteristics involves applying all applicable continuous effects. Also, since we start with "the actual object", any effect that causes Progenitus to lose the ability is applied after its own ability, it ends up without the ability no matter what the relative timestamps are. So, as long as the Aura is attached, whenever state-based actions are checked, the Progenitus doesn't have Protection, so the Aura stays on.

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