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The first of the duo is Ugin, Eye of Storms from the otherwise very un-artifacty Tarkir: Dragonstorm

Wizards of the Coast announced the Magic the Gathering Final Fantasy crossover will also include three Secret Lair drops of special cards

Without much to go by since his ability depends on the contents of the Necron deck or perhaps a monoblack Vehicles deck, we couldn't see much of an opening to use Szarekh as the commander of his own Warhammer 40,000 deck, but, at least at this present moment, we could see him working well in a deck led by Greasefang, Okiba Boss from Kamigawa: Neon Dynasty

The problems here are really twofold