Personally, Mathas is the commander that I'm the least interested to build around, but if / when I do play with him, it'll be as part of the 99 of a Queen Marchesa politics deck: pillow fort (Ghostly Prison), run all my favorite offerings (Volcanic Offering) and tempting offers (Tempt with Immortality), and go from there
Those are cards such as [[Thirst for Knowledge]], [[Thirst for Discovery]] and [[Thirst for Meaning]]

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Two example of these are Mask Change and Mask Change II, both of which are Quick-play
Product Breakdown: 6 Leaders 45 Commons 30 Uncommons 26 Rares 10 Super Rares 2 Secret Rares 6 SPR Cards 1 Treasure Rare 1 DON