[CUnknown]

So, it doesn't even work for Tarrasques? Where's the logic there? I can see the point made for Iron Dragons, but Tarrasques would seem like ideal candidates for the spell.

I would assume that it's a bug if it doesn't work for Tarrasques? Honestly, it doesn't even seem all that unbalancing, either.. it's not like Tarrasques are seen all that much anyway (from what I understand). I think there should be other powerful dragon summons as well.. like Fire Dragons, Ice Dragons, etc.. They could be on par with Dragon Pretenders (only not commanders). It would give water and fire paths some good summons for the late-game.

And if Dragons start to dominate the game, well, bring out the Dragon-Slaying swords and the like. This all seems like win-win to me.

Maybe there could be a random chance like for Tartarian Gate that you get a Dragon commander who has skill in magic, even. Maybe also a random chance that the dragon you summon just eats the summoner in an assassination attempt, hehe.