It's mostly written already
His Jeskai (red, blue, white) colour identity gives a lot of flexibility between power and control, but his key abilities lies in the ability to Bolster his comrades, and also being virtually unkillable unless you have an Exile spell
You had to pay to play with indestructible and they all had high costs
Piper of the Swarm acts as a rat-centric typal lord, token generator, and sacrifice outlet, while the slum-ruling Ogre works as a death payoff that replaces your nontokens with tokens
In his mind, Asmodeus has been chosen by the universe to protect it from annihilation
I dont think Tiamat competes with the top three slots, but its a strong runner up if you want to try something different