Halaster, the Mad Mage

Shroud Simulacrum - Whenever you spend four or more mana to cast a noncreature spell, create a 2/1 colorless Golem Wizard artifact creature token with, “Whenever you spend four or more mana to cast a noncreature spell, create a token that’s a copy of this creature.” {20}, Exile all Golem Wizards you control: Transform Halaster, the Mad Mage. This ability costs {1} less to activate for each Golem Wizard you control. Haha