Interplanar Trespasser

Interplanar Trespasser can't block and can't be blocked.
Whenever Interplanar Trespasser deals combat
damage to a player, choose a creature or planeswalker that player controls. If you do, that permanent's controller chooses a creature or planeswalker you control. Exile permanents chosen
this way. You may cast them for as long as they
remain exiled, and you may spend mana as
though it were mana of any color to cast them.