Anything you get to usefully spend mana on later in the game for free (or just the cost of not having a coloured mana earlier at some point) will give you a vastly improved late game
You can keep changing what card it is, so long as you have the mana to pay for its effect
Thatd be a clunky playable as is, but Scour also pulls an artifact out of your graveyard, so its a tutor that also nets you another card
As far as what creatures to top your curve with, you cant go wrong with Sigarda, a Voltron staple
Meanwhile, the Returners resistance movement carries out covert operations, pursuing their goal of liberating the world from the Empire's oppressive rule
This will make a lot more cards in the archetype viable and makes for all-in but powerful swingy equipment deck and a more aggressive, tempo focused version