[VOW] Dread Fugue
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This one is interesting because its playability can really sorta be gauged through the heuristic of how much play does Inquisition of Kozelik see and how often does it pull a 3 CMC card? The sidegrade of this being it can be played as Dark Inquiry or as sorta a reverse drill bit probably wont come up much, but if it comes up more often than you pulling a 3cmc then this seems like a functional upgrade.