Card cast without enough mana
While playing draft today, my opponent played a card that needs 2 blue mana and 2 others to cast, but he/she had only one island (and enough other lands) and two creatures on the field none of which gave mana or reduced the cost of casting anything. Seemed like a bug to me

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ROC_Guardian#22997 commented
Player had Goldspan Dragon and had 1 treasure, but was able to play a 2 mana counter spell jwari disruption to counter my spell. Then next turn they only had 5 mana from lands and 1 treasure and played spells totalling 10 mana. Playing on Arena on Android
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Hello,
For this issue, please submit at: https://mtgarena-support.wizards.com/hc/en-us/requests/new and select 'Report a Problem in your Event'.
Thanks!
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Icequake1#50814 commented
This is happening a lot more now/ I have now had several games where the opposing player does not have enough mana to cast the spell but is allowed to cast anyway. Your game has a lot of issues/ How about you fix issues instead of hot fixing them which does not correct the issue but only hurts play.