Gambit, Kinetic Cajun

X-Gene — When Gambit, Kinetic Cajun enters
the battlefield, if it was cast for its X-Gene cost,
it gains haste until end of turn.
Whenever Gambit attacks, exile the top card of
your library face down. (You can't look at it.)
When Gambit dies, you may put up to one card
exiled by it into your hand. If you don't, Gambit
deals damage equal to the number of cards
exiled, to any target.