Miracle Stone

Champion a non-Aura enchantment with converted mana cost X or less. (When this enters the battlefield, sacrifice it unless you exile a non-Aura enchantment with converted mana cost X or less you control. When this leaves the battlefield, that card returns to the battlefield.)
At the beginning of your upkeep, create a token that is a copy of the championed enchantment.
Wonders never cease.