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Mechanically, there are few things it can do that other colors also can't, making it feel like dilute and less focused than blue, black, red or green

Counter target activated or triggered ability

If the spell targets more than one permanent you control, you choose which permanent the token is copying as you create the token

Then you can go the Grixis route in a Nekusar, the Mindrazer deck running Wheel of Fortune, Windfall, Merfolk Looter style cards, Seismic Assault, whatever

Look, if Cognivore hits the battlefield in a game of Commander it'll be massive, like a totally swole Tolarian Terror that only looks at instants