The owner of this deck hasn't added a sideboard, they probably should...
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Playing a Sky Swallower, then sacrificing it when you have Endless Whispers out gives you all permanents an opponent controls.
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How do you plan to get sky swallower from play into the graveyard?
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you could use flash!
Or I have a better idea! Use the flashback on cabal therapy, cause it has one! Read before questioning.