Dominion Push

[Agema]

If you've bottled an enemy up in a fortress (often their capital), and it's full to the brim with enemy units and mages such as to make an assault massively punishing, a Domkill may be the quickest and least painful option.

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I don't really rate stealth preaching.

For most nations, a stealth preacher will be purchased instead of a mage. Fewer mages = less research and fewer battle mages. If you have a stealthy mage/priest (e.g. Vanheim, Eriu), most of the best things you could do with it involve magery, not stealthy preaching. I suppose once your research is finished, you could employ all your spare Vanjarls or whatever to ruin someone's Dom.

Offhand, you want to look for stealthy heretics to unpick Dom, maybe - Arco philosophers? MA Man has cheap castles, cheap temples and stealthy priests, so you could quickly devote a castle to pumping out Monks to ruin someone's Dom.

As a mass tactic, it's hard to see working very efficiently. It's got more usefulness just to target a few individual squares: highly productive ones to spoil an enemy's income, or ones you think you're going to fight on and want the morale/god/prophet bonuses on your side.