Jeskai Infiltrator is a rare Creature — Human Monk card from Magic Online Promos (PRM), collector number 55757.
This creature can't be blocked as long as you control no other creatures. When this creature deals combat damage to a player, exile it and the top card of your library in a face-down pile, shuffle that pile, then manifest those cards. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)