yea agree with viffon freezing top 2 mummies and bottom 2 mummies with 2 water is one good strategy if u cant find 2 water support a wind user with cord spell can also bind 2 monster that is standing in a line( and of course if u can get one, earth is the best! with terra)
or may be u can try to sleep eva(with 2 mummies on her 2 sides) and and kill front 2 mummies then
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