Training Grounds reducing colored mana
Had a bug where Training Grounds was reducing the cost of Sleep-Cursed Faerie's untap ability to be paid only with colorless mana. The scenario was as follows.
Board: Training Grounds, Agatha's Soul Cauldron (Omen Hawker and Sleep-Cursed Faerie exiled with it), Hypnotic Grifter.
1 : Tap Hypnotic Grifter using the Omen Hawker's ability from the Soul Cauldron, adding the {C}{U} for abilities only.
2 : Activate Hypnotic Grifter using the Sleep-Cursed Faerie from the Soul Cauldron. The cost that should be paid is {U}, but when displayed on the client it was shown that it was {U} floating and {C} that was spent to activate the ability, which costs {C}{U} to activate.
This bug did end up being relevant in this game because the opponent was playing with Surge Engine, which in this scenario, should not be able to be leveled with all its abilities since they all require at least one {U} to activate, meaning that it should not be able to be leveled with this loop while otherwise tapped out, yet the opponent could still level the Engine because of this bug. Considering that this deck (Blue Training Grounds) has been made public via. YouTube and mtgtop8 listings, I think it is important to fix the bug before it becomes more prevalent.
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[Deleted User] commented
Very first thing Agatha's Soul Cauldron says is "You may spend mana as though it were mana of any color to activate abilities of creatures you control." No bug here.