Does In the Hall of Prophecy stop you from using a Protean Charm you already paid for?

Question

Accepted Answer

Most likely not. Protean triggers before the Dark Arts turn, so a Charm you already paid for should still work; this is the repliers' reading, not an official ruling.

Harry Potter: Hogwarts Battle

Does In the Hall of Prophecy stop you from using a Protean Charm you already paid for?