[K]

I think that there is a misconception that casting Mists of Deception and then Retreating is an unbeatable tactic unless you can kill the caster in the two turns he has to cast and then Retreat.

Not true. If you can kill all the Phantasmal things before new ones spawn, the turn ends. They also die without magical leadership, so that helps.

Here are the turn files, both for the Mod caster as attacker or as defender.