Spoilers!

Planar boundaries are getting breached!

I like what I see so far. No set-specific keywords, though Phyrexian Mana and and TDFCs are in the set.

Battles yet to be revealed.

From a lore perspective, the amount of change to the invaded planes already looks too big to be satisfyingly reversed by a Deus ex Machina ending.

New Planechase!

Yeah, I'm REALLY hoping this has long-lasting ramifications and that it's not all somehow magically reversed somehow.

MaRo has been on record for a while that this will bring about a lasting change both in-world and to the game.

So far everything is on a course to fulfill my earlier prediction that the multiverse will "shrink".

If they somehow manage to nerf the Glistening Oil, they can even keep the Phyexians around as a reasonably-powered but interplanar villain for a while - addressing the Praetors individually, but based on earlier comments they want to end the arc here (with Aftermath).

They also stated that the next set(s) will deal with the ramifications, so undoing ONE & MOM with time travel seems off the table.

I'm also really happy to see more Planechase. Perfect spot for it, and combining these additional formats with commander decks aims them at the correct audience.

I expected a true crossover between planes, e. g. Thalia riding Ghalta, but the shared-plane pairings of legendary creatures are also fine.

The Praetor DFCs are neat, though the Sagas might feel a bit like a planeswalkers ultimate: Rarely relevant to the cards actual power level.

I really like the way off-color Phyrexian mana is used on the Compleation DFCs.

I really enjoy the use of flavor text on the common land cycle - introducing us to ten of the planes getting invaded (though there are more, as we know from the names of some art associated with the set).

• Battle: See Battle.

• Backup: Does it interact with text changing effects at all? Is it treated as an abbreviation (similar to macros in some programming languages), which will inherently involve the same abilities listed below?

• Incubate: Now there are double-face tokens. Although the current rules say "double face card", it wouldn't be a problem to allow other objects to be double-face also, so now it can.

• Chaos ensues: I had similar idea before. (I had previously written such things as "roll the planar die, but choose as the natural result instead of choosing the natural result at random", which is rather messy. So, it is good that now they are doing it better.)