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.
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phg22#74262
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