You have cards like the Pain Lands that come into play untapped, or the Shock Lands that you can use untapped if you need to
I doubt Ill have room for this in most of my Commander decks, but in something recursive and red
At best, this is a creature generator and card drawing machine
Since it requires a dedicated Grixis manabase, I cant imagine it becoming a multi-deck staple like Karn, Scion of Urza or even Chandra, Torch of Defiance
Equipment Matters / Metalcraft This one is a little less likely, but if the set opts to use artifacts for many of the relics and weapons of the Third Age, then metalcraft or other equipment payoffs are mechanics that could work
A lot of nonsense turns into machine guns, like Retribution of the Ancients activated for 0, Squee's Toy, Distorting Lens, Helm of Chatzuk, and most hilariously of all, the on-theme Bloodthirsty Blade