Mind Thief

Flying
When Mind Thief enters the battlefield, look at
target opponent's hand. You may exile a nonland
card from it. For as long as that card remains
exiled, its owner may play it. A spell cast this
way costs {1} more to cast.
Ninjutsu {1}{b} ({1}{b}, Return an unblocked
attacker you control to hand: Put this card onto
the battlefield from your hand tapped and
attacking.)