Example: Diseased Vermin reads, in part, "At the beginning of your upkeep, Diseased Vermin deals X damage to target opponent previously dealt damage by it, where X is the number of infection counters on it." If Diseased Vermin phases out, it "remembers" how many counters it has and also which opponents it has previously damaged
I understand
This can help you sustain your hand somewhat, but this deck suffers greatly in top deck mode
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On the surface it looks like a less than desirable option but since most commanders you'll encounter are multicolour, it becomes the perfect situational spell to cast, like say after a board wipe when everyone is getting their generals back in the game