Hexin Chronocrypt

Flash, reach
Creatures you control have timewalk (You may
exile them and pay {u/r} at any time. Then exile the top
two cards of your library. Until end of turn, you may
play those cards. At the end of your turn, put all cards exiled this way on top of your library in a random order.)
Whenever you activate a timewalk ability, you
gain 1 life, then Hexin deals 1 damage to target
creature.