I like this idea:
The Japanese alteil has another thing like "grimoire activations"
You have to go out of your way to get them. Some grimoires give you some under some conditions. Some units generate them, etc.
Then other units gain HUGE buffs based on them.
I have one unit card that has a skill that sends a level(x or lower) card from the field to the cemetery, where X is that grimoire activations-like stat.
I think that could be great for return. If a falkow player wants to use and abuse return, he can. But he'll have to go out of his way to do so.
During that time everyone has a chance to try to counter it or do their own thing. Or at least set up their field.
So I voted for "other"