Most ambitious summoning?

[ICountFrom0]

The trick at Carteneau, attempting to summon the 12, that was quite ambitious.
Using an untold multitude of primals as fuel for a spaceship, that was ambition.
Being the first (in a generation) to incarnate a primal inside yourself, and becoming Shiva, that was ambition.
Tricking the dragons torn by grief into summoning Bahamut, wild ambition.
Using primals and the ARK to channel enough mana to restore the wastes, was that ambition?
Or how about the twitsted ambitions of the church, elevating 12 knights into objects of worship to make enough belief in them to encarnte them into the Knights of the Round?
Perhaps it's the very first primal, ifrit, used to tame a volcano?
Or Hydalin, or Zodiark? Primals that shaped entire stars?

Lets add Enkidu (from the replies) the first summon that didn't use the flawed ascian ritual, the first primal in untold aeons that didn't hunger for more power, more crystals, and more worship.

I'm not asking what primal is the most powerful. Not what one consumed the most, or had the most invested into it, but what one was the most audacious use of a primal.

What one do you think?