Ravnican Teleporter

When Ravnican Teleporter enters the battlefield,
you may search your library for any number of
creatures whose total converted mana cost equals
X or less and put them into the battlefield with a
teleport counter. Shuffle your library.
When Ravnican Teleporter leaves the battlefield,
shuffle each creature you own with a teleport
counter into your library.
"Think it's easy? You try translocating at rush hour."