Battlefield spell + retreating?

[Tifone]

I wouldn't like a Dispeller. IMHO it don't fit the mood of this particular game - huge national armies<<<<<spells and summons. A way to bring armies back from being obsolete, is not something I would.

This thread is starting to go pretty nowhere ^^ BEs, and Mist of Deception in particular, are not allowed with retreating in the last MP games I checked.
Here in this thread, many are saying that they are legit and a balancing issue with some other late game strong (and overused) strategies. So should they be allowed in MP games too? Talk, people