Need to kill a golem...

[Executor]

I mean the best way to protect yourself from teleporting in mages that are about to cast magic duel on you Golem, or whoever, is to cast call of the wind on you Golem.
He will teleport the mage with magic duel orders in the magic phase and the birds will arrive in the magic phase too but since it is your province the birds will attack first and since they are fliers they will kill the mage in the very first turn.

If he sends more than one mage, the golem will cast returning ( presuming you have the gems and the orders of course) and if he places items to survive the bird attack the Golem will again cast returning. It's a bullet-prof system.

And yes you need to script returning and have the gems for it.