{R} Emry, Lurker of the Loch [Throne of Eldraine Prerelease Promos][PR ELD 043]

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