another noob question...

[Aleph]

Or you can play a nation with reanimating priests (Lanka, MA/LA Ermor, LA Ctis through it's national summons, LA Pangea or all ages if you take a nature/death pretender, Mictlan through the Civeteto) and leave them alone for a while reanimating while you do other things - this has the advantage of requiring no gold/upkeep besides the mages in question, and they don't get hungry and chew through all your supply. I believe Mound Fiends can also reanimate, but they are a little more difficult to get in huge amounts before you've already won. I don't have much experience with most of these nations, but MA Ermor's massed Longdead Horsemen can really make a huge difference.

[Taqwus]

LA Ermor and R'lyeh also get dominion-generated freespawn.

Granted, they're not very GOOD troops sans buffing spells (heh, imagine an army of longdead with Army of Lead and Mass Flight...), but they can be accumulated in huge numbers.