[Xietor]

Yeah, I was over broad.

The gist of the rule is to take advantage of a bug that leaves a battlefield enchantment up after the mage casting it dies or retreats. Players have no control over when their mages die in battle.

But if the backbone of your strategy is to have a mage equipped with forbidden light(autocast solar brillance) enter a battle with some other commanders and chaff,then cast ritual of returning and blind the other army while he kills your chaff, that is an exploit.

Admittedly, I bought forbidden light for just this purpose.
But it will not sit unused in my lab. Try to avoid strategies where your mage that casts the battlefield enchantment purposely leaves the battle before it ends.

Retreating other mages who buff you own troops is fine. It is the spells that destroy the enemy that are exploitive if the casting mage is not on the battlefield-so say the developers.