Unable to deselect mana with specific properties
If you have floating mana in your mana pool, and you cast a spell that uses that colour of mana, that mana will automatically be used to pay for the spell.
This happens even if full control is turned on and Auto Tap is turned off in settings. There is no way to prevent the floating mana from being used to pay for a spell.
Normally, this wouldn't be a problem, but there are cases where floating mana can have special properties. In these cases, you may wish to cast a spell without using the special mana, so that you can use the special mana for a second spell. For example, the +1 of Domri, Chaos Bringer produces such mana.
Even manually floating enough mana to cast the spell, in addition to the floating mana with special properties, prior to casting the spell, does not work. Even with full control turned on and Auto Tap turned off, as soon as you attempt to cast the spell, the special mana is automatically deducted from the mana pool to go towards paying the spell.
It is possible to choose which mana, from the mana pool, pays for the generic costs of a spell. But coloured mana is automatically deducted, even if it has special properties.
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UndeadRabbit#84829 commented
This is especially frustrating with a deck that I made recently using Primal Wellspring. If I have my Primal Wellspring mana floating along with regular mana, there is no way choose which floating mana is used to cast a spell like "Narset's Reversal" which becomes very relevant one of the spell combinations in my deck.
An example situation where it is vital that I get to choose which mana is used is as follows:
Board state:
- Lotus Field
- Island
- Primal Wellspring
Cast sequence:
1. Enable Full Control
2. Tap out to cast "Pore Over the Pages"
3. "Pore Over the Pages" is copied by Primal Wellspring
4. Resolve the copy of "Pore Over the Pages" to draw 3, discard 1, and untap the Primal Wellspring and the Lotus Field
5. Tap Lotus Field for (U)(U)(U) and Primal Wellspring for (U*)
6. Cast "Narset's Reversal" targeting the original "Pore Over the Pages" USING THE PRIMAL WELLSPRING MANA (the way the game is currently coded, it is impossible to guarantee that you get to use the primal wellspring mana)
7. Use the copy of "Narset's Reversal" to return the original "Narset's Reversal" to your hand
8. Use the copy of "Narset's Reversal" made by the first copy of "Narset's Reversal" to target "Pore Over the Pages" that is still on the stack
9. Allow the remaining copy of "Pore of the Pages" to resolve drawing 3, discarding 1, and untapping "Lotus Field" and "Primal Wellspring".
Result:
When all is said and done you now have (U)(U) floating and have an untapped "Primal Wellspring" and "Lotus Field". You also have both your "Narset's Reversal" and your "Pore Over the Pages" back in your hand, along with 4 of the 6 cards you've drawn. This SHOULD be an infinite combo gaining infinite (U) and infinite card draw, but every time I try doing it at some point in the combo, the game simply doesn't use the "Primal Wellspring" mana to cast "Narset's Reversal" fizzling the combo, and infuriating me, because there is nothing I can do to ensure the mana is used correctly.