mana drain prismatic ending
Prismatic Ending and Floating Colorless Mana
If you attempt to cast Prismatic Ending with colorless mana floating, the client will use that mana even in full control mode. Outside of a few edge cases, there is no reason to spend colorless mana on Prismatic Ending. This is most relevant in the Timeless format, where Mana Drain is a commonly played card, and Prismatic Ending is relatively likely to be in decks that also contain Mana Drain. This has been a bug for months and I've lost several games because of it
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Flexo#38467
commented
This is such a frustrating bug! Even with full control on, as soon as you cast Prismatic ending it auto-pays with colorless mana and there's no option to cancel or undo. Please fix this already!