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Enter the Hour of Devastation event
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Play the top node (req Bolas)
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Select a planeswalker for the right node (I picked Gideon)
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Make an event deck for the PW assigned to the right node
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Select the right node
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Click the “View event deck” button in the bottom left (blue button with an hourglass, just to the left of the large green FIGHT button)
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Close the “View event deck” screen
Result: now it’s showing me a Bolas v Bolas matchup, instead of a Gideon vs _ matchup! It seems that viewing the event deck either moved me to another node or (worse) changed the matchup for the current node to an invalid one.