Remove “stacking” from Burning Chant

[Zeon-Quan]

Stacking is fine, but Burning Chant should never cost 0 mana for such a powerful ability. In my opinion, it should cost about 5 mana to use. If it's going to remain at 0 mana, then the stacking feature should be removed. The ability is broken, and has been broken since the beginning. It should be fixed.