Diligent Armorer

When Diligent Armorer enters the battlefield create an armament token.
(It's an artifact with "{1},{t}, Sacrifice this artifact: put a +1/+1 counter on target creature you control. Activate this ability only as a sorcery")
Whenever one or more +1/+1 counters are put on a creature you control you may draw a card. If you do, discard a card.