The card fifty feet that triggers a d20 roll when a support loses shiled has haed crashed my game twice when I have cascaded it. I tested it what different suports and its still crashing
Just a tad more information it isn’t crashing the game in a reset. It is locking up the mana cascade when matched. 
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me.
Rebeca.
Treasure chest will also cause a mana cascade fail when triggered.
And now spiked pit trap also has been found to have the same mana cascade fail
We could not reproduce this issue. If you face it again please let us know.
In order to help us, please provide the following information if you have it (you can PM me the answer if you prefer, or send it to Customer Support in-game):
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A screenshot of the battle log?
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The Planeswalker you were using and its level.
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Which Event and Node.
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All cards in the deck and possible interactions that might have happened.
Thank you,
Rebeca.
@Oktagon_Support pretty sure I gave you a video reproducing this but i will checked that this wasnt fixed in a previous update which I think it may have been.