I would suggest 2 new status effects.
This one is about changing a troop’s mana color and amount of mana.
A negative effect would change a troop’s mana color, the negative banner color is privileged. Either colors are changed or colors are replaced with only 1 color.
This color change can be combined with increasing the amount of mana.
A question if the status effect ends the collected mana would count or not.
This negative effect is about once a troop mana is filled it casts against the ally team immediately.
If the troop is a damage dealer it casts the spell immediately and deals damage on one the ally’s troop.
If the troop explodes, destroys, creates gems the mana made would fly to the enemy’s team, the skull exploded would hurt the ally’s first troop.