Reddit user SoupAngel44 mentioned in the comments of an associated Reddit post that Exhaust could end up functioning like Exert but give the attacker stun counters as a means of keeping it tapped on future turns
InDuskmourn: House of Horror, players will dare to enter this plane-enveloping House where their fears come to life
This list has angels, hate bears, token makers, and all kinds of white creature flavor
Alternatively, you can stockpile Energy for a Voltron-style swing and end opponents in a single turn
You also get access to four colors, which include good ramp cards in Simic colors along with removal spells/sweepers in Orzhov colors
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