When a creature Regenerates, it survives any kind of destruction effect, be it hard removal or damage
For example, if you cast Combat Thresher for its prototype cost then the spell will have a mana value of 3
I think perhaps part of why I like him so much is that Ive cracked building a Bracket 2 deck with him, and its very satisfying to have a deck that plays less efficient removal and a slower gameplan but also just works fine as a deck
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With that in mind, it's full of instants and sorceries, and in a multiplayer format like Commander will likely ensure you want to keep at least some mana untapped so you can respond to threats
Some more ramp would probably help, but I do not want to cut more than one or two lands, if that, to get more ramp