Steelwil, Molder of Metal

+1: You may sacrifice an artifact. If you do, the next artifact spell you cast costs mana less to cast equal to the sacrificed artifact's mana cost.
-1: The next artifact spell you cast gains your choice of modular 1 or splice onto artifact creature. (The creature gains the artifact's abilities.)
-1: Create two 1/1 colorless Golem artifact creature tokens with modular 1.