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There are some potential problemsweaknesses specificallyhere

Where the real power lies, though, is with Sphinxs activated ability

Cryptic: The focus of the classic Space Hulk game that pits elite Space Marines against these purpose bred hunters, Genestealers are excellent and terrifying infiltration units, serving as the forerunners of Tyranid invasions

You can achieve a similar effect with a free sacrifice outlet, Mikaeus, the Unhallowed, and a persist creature like Putrid Goblin

Pair it with something that removes -1/-1 counters or adds +1/+1 counters when it comes into play and a free sacrifice outlet like Ashnod's Altar and this creature goes infinite in so many ways