Unpayable Cost despite having Sufficient Mana
I attempted to cast a spree spell, and then cancelled it due to not enough mana. I then attempted to cast a regular instant spell for which I had plenty of mana and Magic Arena bugged out and gave an error about an unpayable cost even though I definitely had sufficient mana.
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WotC_VNDR_Marjorie#78222
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DAC169#34537 commented
Were you trying to cast an Instant on your opponent's turn while they controlled Myrel or Kutzil or some other card that doesn't let their opponent's cast spells on their turn?