Invocation

Cast one Fusion from your library or graveyard
by paying its fuse cost rather than paying its
mana cost. You must pay the fuse cost by
discarding cards. If you want to cast an Invoked
this way, you may also pay the fuse cost by
exiling cards from your field and/or either
player's graveyard.
If this card is in the graveyard at the beginning
of your end step, you may return an exiled
Aleister the Invoker to your hand. If you do,
shuffle Invocation into your library.