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This effectively locks opponents out from using their lands, mana rocks, and other key resources

It's a low bar to meet too, considering how popular typal decks are in Commander

Vintage Cube is more or less the fast mana format, and its easy to understand how one player having access to six mana to the other players four can lead to all kinds of snowballing advantages

Infestation Sage Bartolom del Presidio Sephiroth, Fabled SOLDIER Like a Vengeful Bloodwitch that triggers off everyone's creatures, Sephiroth, Fabled SOLDIER drains your opponent whenever a creature dies

This is a symmetrical effect, meaning it hits you too, but in a creature-heavy Hatebear deck, you break that symmetry easily