The result is a physical collectible that looks and feels like a real trading card
It offers six card options you can reasonably expect to have access to, since they are attached to your commander, which frees up space in your deck for all those Relentless Rats
Everything else encompasses board wipes that miss your tokens (Hour of Reckoning, Citywide Bust), removal that works well with a small army (Devouring Light, Conclave Tribunal), card draw which again uses the army (Camaraderie, Collective Unconscious, Overwhelming Instinct) and just generally good utility cards (Eternal Witness, Path to Exile, Reclamation Sage)
This can help stall an opponent so the player can take full advantage and win, pull ahead, or come back in the game