[Soyweiser]

Originally Posted by Ond

Yes thats a valid concern. With a fix like this, the AI should never be allowed to use your gems, unless you have scripted it to do so.

Even then, teleporting in a few sacrifical units to trigger gem use (bonus, teleport them home as last script action). Ghost riders, and a normal sacrifical move attack, can trigger three seperate combats. If the enemy army is large enough, and scripted enough spells, you can drain somebodies treasury in almost one turn. (Even better, if your enemy has multiple similar armies in the field, all scripted to cast every global battlefield spell there is).

Also, not being able to put gems on commanders makes the gem removal random event even more dangerous. (Lets say this event hits you just before a major battle. No gems in the treasure, no gem spellcasting. Dead army).