Most Commander decks on eBay are loaded with low-quality filler cards to keep costs down, which comes at the expense of power, performance, and ultimately fun
Corrupt costs one more, and deals X damage to any target where X was your Swamp count

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Commander, or Elder Dragon Highlander (EDH) as it was called before Wizards decided to develop for it directly, is probably the most popular casual MTG format available
I could also see Sarkhan being the key piece of a R/B Control deck which is the kind of deck that always looks better on paper than how it performs because of the variance in its draw steps and lack of velocity to filter through the deck, the exact problem Sarkhan can solve
Dion, Bahamut's Dominant // Bahamut, Warden of Light) Dion enters the battlefield with a 2/2 White Knight buddy in tow, then lifts your whole Knight army into the sky with Dragonfire Dive - his static effect that gives all your Knights flying during your turn