And, of course, Wayfinder offers a 1/1 body to sit on the battlefield, which eventually means it can be sacrificed for an Elder Deep-Fiend in an Emerge deck or block on a key turn of a race for the more all-in Dredge-style deck
Shock is the baseline
Sure, you can combo it with cards that put extra counters, but if you can dedicate that much resources to one card, you can dedicate those resources to other ones that win you the game on their own, rather than relying on a combination of cards
What happened to Embercleave
For instance, Coalition Victory requires eight mana and your commander to be out to win, while Gifts Ungiven is effectively either a combo piece in high-powered decks, or a fun alternative to Fact or Fiction anywhere else
Calhoun comes loaded with two abilities, Resist +1 and a neat special ability called Level Up