Nahiri the Lithomaster

+1: Look at the top three cards of your library. You may reveal a creature or artifact card from among them and put it into your hand. Exile the rest
-X: Create a 1/1 white Kor creature token. Until end of turn, activated abilities of artifacts you control cost (X) less to activate.
-6: Nahiri, Stoneforge Savant deals damage to any target equal to twice the number of artifacts you control.