Essence Tap

{x}, Return Essence Tap to its owner's hand:
Exile target artifact or enchantment with a
converted mana cost X, then return it to its
owner's hand at end of turn. You may search
your library for an artifact or enchantment card
with a converted mana cost X or less, reveal it,
put it into your hand, and shuffle your library.
At the beginning of your next main phase you
may add an amount of mana equal to that exiled
card's mana cost. (This includes color(s) and type)