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Infernal Phantom reads to me as a Blue-Red card, since Blue-Red is the Rooms archetype (see the signpost card Intruding Soulrager)

Eye of Ugin [] can put that mana to good use by searching for and casting any of our Eldrazi friends, while Strip Mine [] and Wasteland [] prevent our opponents from ever being able to match us in resources

It's also an enchantment for those decks that are about those sorts of things

The ability to lock the opponent out of the game (with a card tutored from your sideboard) for six mana is incredibly strong since it only takes a single sideboard slot in a deck that already runs Karn

The Esper combo of Black, Blue, and White facilitates a lot of drawing and discarding which can help Temmet empower his army

Withering Curse Printed in the newly released Secrets of Strixhaven set, Withering Curse seems like a very strong board wipe, but I think it's too soon to say for sure