Cards that ramp are varied and numerous, including: Cards that put extra lands into play, like Rampant Growth Cards that tap for mana, like Sol Ring or Birds of Paradise Cards that reduce costs, like Goblin Electromancer Cards that produce short-term bursts of mana, like Dark Ritual or Dockside Extortionist Ramp is an essential element of Commander deckbuilding
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Steam Rollers With all that said, we need ways to end the game
Taken as a package Barricade does a hell of a lot for its low mana cost, in enough matchups to see Standard sideboard play at the very least
The ones we can are out of budget, otherwise I would be adding in Rhystic Study and Mystic Remora
Chaos Warmaster Abaddon the Despoiler has the favour of all four Chaos gods, so he's a natural choice for Commander