Mass-produced Reanimating Priests: Exploit?

[Agrajag]

kasnavada said:
The fact that they don't cost upkeep anymore sounds like the exploit to me...

They cost no upkeep because they are lame undeads. Even Dusk Elders or Tartarians don't cost any upkeep. WAD.
You might say that this makes this spell too good/overpowered/unbalanced, but that's not the same as an exploit.

kasnavada said:
I mean, the MR argument is a joke. You can just buy again the same amount of mages and priests in a few turns. Even if half of your low MR resurrected units get killed, you doubled your capacity for buying new fresh mages !

1) Doubled? Upkeep is just 1/15 of unit cost, so zombifying all of your mages will increase your mage money by 6.67%. 3.33% for priests.
2) Losing half of your mages is serious business! And it is going to take some time to recruit them back, not just gold.