Mictlan , how to play it effectively

[Thufir]

Sheap said:
The in-combat Call Horror spells aren't quite as good, because whoever conjures the horror up is likely to be killed by it.

I have a slightly OT question, but one I've been wondering about for a while. That is, in SP play I've got an SC pretender who is using a "Shield of the Accursed" and when using this, everything in sight seems to get horror marked. Would it work as a tactic, to take an SC attacking the rear, armed with this shield while a mage in your own rear is casting the Call Horror spell? And/or is it helpful to have this shield in play while casting any of those spell that incur a risk of horror attack?

I guess I should test this on my own, but it would take me a while to setup a gamere where I have the in-combat Call Horror spell.