Ultron's Manufactory

When Ultron's Manufactory enters the battlefield, you may search your library and/or graveyard for a card named Mind Stone, reveal it,
and put it into your hand. If you search your
library this way, shuffle it.
Historic spells you cast cost {1} less to cast. (Artifacts, legendaries, and Sagas are historic.)
"This is what I've been waiting for.
All of you against all of me!" —Ultron