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If you just want a threat play one that is an artifact and doesn't need coloured mana

Crystal Barricade AND Rune-Sealed Wall Next is this Azorius artifact Wall defender duo

Cid, Timeless Artificer Dragon's Approach Hare Apparent Persistent Petitioners Rat Colony Relentless Rats Shadowborn Apostle Slime Against Humanity Tempest Hawk Templar Knight

Scholar of the Lost Trove Scholar of the Lost Trove doesnt have the same combo potential as Chancellor of the Spires, but your deck is usually primed to take advantage of your own spells rather than your opponents

Oh, it also sacs artifacts for value and can do all of this at instant speed