Katana Maintenance Kit

This artifact costs {3} less to cast if you control
a Samurai or Ronin creature.

{2}{t}; Put five Indestructible Counters on target Artifact. Remove an Indestructible counter from that artifact at the end of every turn. (You cannot add more Indestructible Counters onto an Artifact which already has Indestructible Counters on it).