green protection cards mtg Infested Roothold [Darksteel] prevent that damage. This is the most powerful

Belakor doesnt help you ramp to your demons, but it does give you a massive wincon in the command zone, and being a Grixis commander gives you access to blue, which means you can use some of the cheaper, powerful blue-touching demons from 40k like Exalted Flamer of Tzeentch

I think the first version of Shah of Naar Isle had a template like "Echo Opponent draws three cards," but the rules and templating didn't like it that way, so they changed it to a 0 echo cost with a trigger

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Again, with plenty of excellent new cards to play with, you can certainly upgrade the precon on a reasonable budget and even indulge in the themes of Phyrexia: All Will Be One