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Describe the Bug:
Gideon, Martial Paragon is checking for 6 mana (4C2W) instead of its actual cost of 5 mana (4C1W)

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
most recent version: Happy Holidays 2021 / gauntlet

What exactly should be the correct behavior/interaction?
Gideon, Martial Paragon taps for 5 mana (4C1W)


Are any other cards possibly affected by this bug?
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I guess you mean the casting cost of Gideon, Martial Paragon and not an activation cost which Gideon, Martial Paragon doesn't have but your comment

Dunpeal wrote:Gideon, Martial Paragon taps for 5 mana (4C1W)

implies.
I don't confirm the above in dev, probably there was a card in play that increased casting cost by or you are talking about a different card.

Oops... didn't attach a save file! I'll update this report when it happens to me again