Path to Exile and Swords to Plowshares are your bread-and-butter answers that exile threats cleanly for just 1 mana
In Archenemy, when you finish resolving a scheme (or when an ongoing scheme is abandoned) it just goes to the bottom of your scheme deck, so you never have to worry about running out, even if your game does run long
Loxi: You probably only want this in decks that have a bit of control over the X cost here, but it's a nice way to filter your hand and grow your board
Its especially useful with effects that care about land types like domain or converge and has found a home in decks looking to combo off with Valakut, the Molten Pinnacle
There are probably a couple of other quirky things you can do with the tribe too
Youve got Breya, Etherium Shaper, Emry, Lurker of the Loch, Daretti, Scrap Savant, Roxanne, Starfall Savant, Ygra, Eater of All and Urza, Chief Artificer etc