Mithrix

When Mithrix enters the battlefield or attacks,
reveal cards from the top of your library until
you reveal an artifact card. Exile that card
& shuffle the other revealed cards into your deck.
At the beginning of your post-combat main
phase, if you have at least 3 cards exiled with
Mithrix, untap & transform him & there is an additional combat phase after this phase.
Partner with Providence