Monstrous Emergence
During a Duskmourn Sealed match I attempted to cast Monstrous Emergence by choosing to reveal a creature (Grasping Longneck) from my hand in order to deal damage to its power to an opponent's creature, but it wouldn't let me select the creature in my hand. Then later, when I had cast the Grasping Longneck an attempted to cast Monstrous Emergence again and choose to select a creature I control in order to deal damage equal to its power to an opponent's creature, it would only let me select my Grasping Longneck both times, killing it. This certainly caused me to have no way to win since I was now down two cards.
Buzenski#43517
shared this idea
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DAC169#34537
commented
For compensation for Draft problems go to https://mtgarena-support.wizards.com/hc/en-us/requests/new/ and select "Report a problem with my event."