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some of his monsters don't have attacks which feeds the cube even more

How does that feed the cube? Just because those monsters aren't attacking the cube?

Every time a monster dies the cube gets +1. So if your monster died it's +1 but then it gets resurrected - when it dies again it's another +1 to the cube.

Yes, and I had three resurrections in this match, which is the most possible currently: one from the summoner, Chanseus the Great, one from Angel of Light, and one from High Priest Darius.