Children's play can place tough demands on surroundings, something that also applies to rugs
Requiring you to have something else good, and something else that is good enough to warrant a replacement
Then, because it wasnt already awesome enough, Kardur drains life from opponents whenever an attacking creature dies
While likely to be a fan-favorite among tribal decks in Commander, it also seems plausible that this powerful mythic could find a home in Standard, Historic, and beyond, especially with so many powerful Angels, Giants, and Elves arriving in Kaldheim
Good question
Coming in with a Treasure hearkens back to how great Nissa, Who Shakes the World was by reducing her effective cost, but the second ability is where its at