Valgrun, Gifter of Lost Tales

When Valgrum enters, reveal cards from the top of
your library until you reveal an enchantment card
with mana value X. Exile it and put the rest on the
bottom of your library in any order. For as long as
this card remains exiled, you may cast it.

{3}{r}{g}{t}: Exile target enchantment you control.
Return it to the battlefield under its owner's
control at the beginning of the next end step.