Frost Rogue of Irithyll

Morph {u} (you may pay {3} to play this card face down as a 2/2 colorless morph creature and flip it over any time for its morph cost.)
Freeze 1 (Whenever this creature deals combat damage to a player he or she gains 1 freeze counter, then if they have 6 or more freeze counters, that player removes them, takes 3 damage and discards a card at random.)