[mathusalem]

I find the Tartarian gate at 25 a little too expensive, unless I have more chance to have a commander or maybe the level (D8 or 9 ?) should be decrease :
To make a tartarian factory, you have to plan this since the beginning : high Death pretender, maybe Construct 8 for +4D, Enchantement for Lich and Gift of Health / Reason, ...

But with an overpriced Tartarian Gate, nobody will try this strat in MP.

I think 15 gems and -1 to the casting level is better.