He plays in an unusual space with the unique-to-New-Capenna blitz mechanic, hes well-statted as a 3/3 for only three mana, he allows for a lot of exploration and fun deckbuilding thanks to being three colors, and he also lowers the cost of your blitz spells so long as you play him from the command zone multiple times in a game
In Commander games, you may have two commanders if one of them is a card with Doctor's companion and the other is "The Doctor." That means a legendary Time Lord Doctor creature with no other creature types
And for fans of her films royal family, Elinor, Hamish, Hubert, Harris, and Fergus are all represented in the set as well
You could obviously replace all your Evolving Wilds with Escape Tunnels, since it's a strict upgrade, but don't overstate the upside on Tunnel either