Here is take 2... forget unsummoning things, just let otyughs chow down on them as you force them out.
The brilliant part is that you eat them before they can attack.
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Looks like it consistently grinds champs.
More rigorous testing is needed but out of about 12 games i've won 8.... 3 of the losses were to clever corpse explosion wielders so beware of death wielders... poison isn't too fun for the otyughs either although the fractals are there for that reason (fractal otyughs then just use ghosts as infinite chow).