Pentad Prism with Colorless Mana Floating
Pentad Prism cannot be cast for Sunburst=2 if you have a colorless mana floating that you can't undo (e.g. mana from Sol Ring, Mana Crypt, Mishra's Workshop, etc., where you already spent one of that mana on another spell), even if you also have colored mana floating. When you go to cast the Prism, the game autopays the colorless mana, and undoing that payment of colorless mana also undoes the casting of Prism. This was in full control mode, and with auto-tapper off.
This is also an important, potentially game-losing issue - I lost a game due to being unable to use Prism to filter my colored mana into a different color to cast a Minsc and Boo pre-combat.
I propose that not only should Sunburst cards have special handling preventing mana (especially colorless mana) from being automatically paid, but that a single press of the undo button (Z) should only undo mana payments, and should require a second press to undo the casting of the card itself.
Lastly, I have not checked, but there is a chance that this bug also applies to Converge and Adamant cards, so that is likely also worth looking at. (Or alternatively, if Converge and Adamant cards already have special handling, maybe that can be applied to Sunburst?)
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Glieken#66518
commented
Just happened to me with mana drain which lost me my game :(
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Rezzahan#77802
commented
I stand corrected. Colorless mana is indeed used without player input or permission.
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TechnoMikl#57482
commented
Here's the game log for the testing I did if that's at all useful
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TechnoMikl#57482
commented
Rezzahan - please test this, as you will see that although you can manually select mana to pay, the floating colorless mana gets automatically paid (in the same way that floating colored mana that is included in the pips in the mana cost gets automatically paid) before you even have to option to pay the rest of the mana cost. In fact, if you have two floating colorless mana, the Prism will be automatically cast with only colorless mana, and you won't even be able to undo the casting.
Also, I just did some more testing, and this bug also applies to Converge cards, Adamant cards, Paragon of Modernity, and Springmantle Cleric
Again, if you have floating colorless mana, it will be automatically paid into the mana cost of whatever you try to cast, even if that spell/ability benefits from only being paid with colored mana. If you don't believe me, load up a game with Skyrider Elves, Clockwork Servants, Bring to Lights, etc., and some sources of colorless mana, and see for yourself!
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Rezzahan#77802
commented
You can manually select the mana in your pool to pay for costs. I'm not talking about tapping lands manually. You can actually choose what mana to use after you've generated it.