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Hmm, it turns out it's not impossible at all; it worked on the 4th attempt.
The clone of the hippos got nervous, so I took out the archdevils in the very first turn. And the computer, foolishly, summoned demons in their place, so it could no longer restore the archons as a sacrifice. In the following turns, we simply clone the hippos – and there are no difficulties – in the end, I had 658 hippos left.
P.S.
Yes, I placed the hippos in the upper corner.