Oppressive Rays is a great taxing piece that replaces itself with Sram out, and Reprobation is a great way to remove an opposing commanders abilities
Counting the only Legendary Spacecraft we've seen, that makes 22 cards worth talking about in the context of this change to the format, and there's certainly a few possibilities for your next Commander
The Corners The corners are a less important way to help figure out what set a card is from
This means that, if one of your opponents has no other permanents, theyre forced to sacrifice a land
The value of X is calculated only once, as Heidegger's first ability resolves
This takes very little work to make obnoxious, and you only have to get a couple of cards out or a buff or two to make this ability very absurd indeed