Emrakul, The World Anew Madness Cast Issue Arena
I cast Refute to counter a spell and had six untapped islands available after the cast, in the discard selection I discarded Emrakul, The World Anew, it gave the option to Madness cast for six, but it would not allow me to pay using my six islands. As far as I know the 6 colorless mana is not restricted from being paid for by colored mana, I believe a bug has the system in Arena thinking that it specifically has to be “colorless” mana. If this could get resolved that would be fantastic.
fusaro_phil#13919
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Rezzahan#77802
commented
The madness cost IS specifically six COLORLESS mana. Not generic, colorless. Islands cannot produce colorless mana, so you did not have the resources to pay the madness cost. If the cost was 6 generic mana, it would be shown as a 6 in a circle, not six diamonds.
107.4c The colorless mana symbol {C} is used to represent one colorless mana, and also to
represent a cost that can be paid only with one colorless mana.