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

Sliver Queen started going up in price

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

Lots of Reasons The following swaps happen for a variety of different reasons

Treasures are so common in Magic now that an effect like this, which makes them better and makes them a win condition, has a very real chance of becoming a new Commander staple