Use colorless mana first
I had 4 colorless mana and 1 red mana in my manapool and played a (red, manavalue 4) card with Xanathar. The game let me choose how I wanted to pay, I clicked the manapool. It then used the red mana and 3 of the colorless.
I understand that the click chose the whole manapool rather than just the colorless mana, but it seems to me that the default behaviour should be to use the colorless mana first.
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Unseelie#58379
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