Prosperous Thief

Ninjutsu {1}{u} ({1}{u}, 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 " {t}, Sacrifice this token: Add one mana of any color.”)