A-Prosperous Thief

Ninjutsu 1 generic mana blue mana ( 1 generic mana blue mana , Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever one or more Ninja or Rogue creatures you control deal combat damage to a player, create a Treasure token. (It's an artifact with " tap , Sacrifice this artifact: Add one mana of any color.")