Emry, Lurker of the Loch (Serial Numbered) - March of the Machine: Multiverse Legends (MUL)

This spell costs 1 less to cast for each artifact you control.
When Emry, Lurker of the Loch enters the battlefield, mill four cards.
T: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)