As for the Commander Legends decks, both commanders are relevant new cards for the format
Last of all, Mardu (Black/Red/White) decks in formats like Commander can also take advantage of the Engine's Meld ability, which provides you with a game-winning creature as early as turn five
Tron Lands The Tron lands, Urza's Tower, Urza's Power Plant, and Urza's Mine are pretty pants on their own, but they're strong when you use their powers combined (much like Voltron which, believe it not, is where this trio of lands gets its nickname)
Dragonstorm is meant close out the final chapter of the Dragonstorm Arc, with the five resurgent clans of Tarkir striking back against the dragonstorm threat
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It's also a combo piece with Phyrexian Altar, though you'll also need a crime committing effect like Blood Artist in play to make that loop work