The problem in this case is that the client auto spends colorless sources
In the game from the attachment, I had used Enigma Jewel+Omen Hawker to activate Wizard Class Lv2, which drew me the Biomancer and I had 1 colorless "only for activated abilities" floating.
I then played the Biomancer with Hall of the Storm Giant and wanted to activate Nykthos with Sunken Citadel.
When tapping, it automatically spend the one floating colorless instead of the 2 U from Sunken Citadel, leaving 1 blue "can only be used for activated abilities from Lands" mana floating, mana which can't be used to activate the Biomancer/Cycle Shark Typhoon/Level up Wizard class.
If I hadn't had an extra mana+land drop to play another Nykthos, it could've been a big issue.
That was just one example of this problem and I can foresee a lot of problems down the line
The problem in this case is that the client auto spends colorless sources
In the game from the attachment, I had used Enigma Jewel+Omen Hawker to activate Wizard Class Lv2, which drew me the Biomancer and I had 1 colorless "only for activated abilities" floating.
I then played the Biomancer with Hall of the Storm Giant and wanted to activate Nykthos with Sunken Citadel.
When tapping, it automatically spend the one floating colorless instead of the 2 U from Sunken Citadel, leaving 1 blue "can only be used for activated abilities from Lands" mana floating, mana which can't be used to activate the Biomancer/Cycle Shark Typhoon/Level up Wizard class.
If I hadn't had an extra mana+land drop to play another Nykthos, it could've been a big issue.
That was just one example of this problem and I can foresee a lot of problems down the line