This planeswalker isnt higher up because it doesnt provide phasing per se
This clearly doesnt belong in just about every deck but if your local meta has heaps of equipment matter decks, you can turn someones 20/18 First strike, menace, temple, flying, lifelink Rograkh back into a more manageable 0/1
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Then you can also ping things to finish things off, kill smaller toughness things like Esper Sentinel and Soul Warden and Birds of Paradise, and loads more
Additionally, as Rograkh is the cheapest commander in the game to cast, it can pair quite well with sacrifice outlets such as fellow Partner commander Tevesh Szat, Doom of Fools
Myrkul, Lord of Bones is an Abzan commander from the Baldur's Gate Commander decks built around the most persistent board presence the format has ever produced