NaOs, King of the Cardsmiths

When you cast NaOs, if you spent blue mana to
cast him, go to mtgcardsmith.com and click
"random card." When you do put a copy of that
card into your hand. Custom spells you cast cost {1} less to cast, custom creatures you control get
+1/+1, and custom planeswalkers you control
enter the battlefield with a additional loyalty
counter. Whenever you cast another custom card,
go to mtgcardsmith.com and click "random card."
When you do put a copy of that card into your
hand.