When you look and see cards like Golden Guardian or Omnath, Locus of Rage, they're largely filling this role, and others are more filled by utilitarian aspects like an Eternal Witness that you meet along your adventures
Once you make endless tokens, cards like Hildibrand Manderville, Intangible Virtue, Invasion of Tolvada, and Akroma's Will help push you over the finish line
With limited copies, proofs can sometimes get expensive (for a mox sapphire proof for instance, expect to pay a few thousand)
This Human Token card could be beneficial in a deck focused on tribal synergies or token generation strategies in Magic: the Gathering
Knowing you have no way to really win other than your 3/1 flying Vendilion Clique can be a scary thought
So why would you play Karador over other excellent Abzan commanders like Kethis, the Hidden Hand or Nethroi, Apex of Death