The Doom of Marayda

Prophecy (When you draw this, you may exile
it face up. At the beginning of your upkeep, if it's exiled this way, put a prophecy counter on it.
You may cast it for as long as it remains exiled,
and it costs {1} less for each prophecy counter on
it.)
Destroy all enchantments. Any enchantments that are not destroyed this
way are exiled.