The color combination does give us access to some excellent gold cards in Renegade Rallier and Voice of Resurgence, as well as Chord of Calling as a strict upgrade to Ranger of Eos
Ayaras mana cost of 3 is made up for in its role as a card-drawing sacrifice outlet
Toggos Rocks give you a ton of removal for small utility creatures, and also go fantastically with cards like Reckless Fireweaver and Ghirapur Aether Grid
15 Mathas, Fiend Seeker A deceptively strong commander, Mathas, Fiend Seeker is a Mardu Vampire that provides political bargaining chips, something that can be quite useful in a multiplayer format like Commander
I like it but by itself, I don't think that would be enough to merit the six mana cost
The mechanic that didn't end up getting made was called quest