Emry, Lurker of the Loch (Neon Dynasty Commander)

Legendary Creature Ñ Merfolk Wizard - Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
When Emry enters, 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.)