Rather than review them all, I figured I'd just list what I think has a shot.
UNCOMMONS: Most of these are limited chaff (that didn't even feel good in limited). I think there are two exceptions:
- Invasion of Zendikar: While I think this is generally worse than Skyshroud Claim and Migration Path, and I think 4MV ramp is too slow in most decks in 2023, and I think most decks don't want more than 2 of this effect, it isn't strictly worse. The backside is nothing special as a 4/4 mana dork, but it does trigger landfall. If you care about devotion, landfall, elementals, or having a variety of card types for delirium this might occasionally get a nod.
- Invasion of New Capenna: This is not far off from a non-flashbacking Rite of Oblivion. If you can win the battle the backside is fairly unique as a pseudo-tribal anthem. I can see this getting occasional play in WBx tribal decks as a removal spell that also anthems your squad later.
- Invasion of Gobakhan seems interesting in Standard as only the second "white Thoughtseize", but that sort of effect is sorta mediocre in Commander. The backside is intriguing but seems a bit too much work - the +1/+1 counter part is sort of unique. For protection, this isn't worth it - we have too many great ways to protect without having to jump through the hoops of clearing the battle. Also, counters on end step is a pretty weak. Overall this is a pass for me in Commander.
- Invasion of Arcavios: This is sort of a combination of a tutor and a recursion spell but at 5MV, it's very expensive. The backside is a cheaper Swarm Intelligence , but 7 defense points is a ton to chew through. Rare will be the deck where this is good, but I suppose I can see it in places like Talrand, Sky Summoner who loves doubling his spells and also can raise an airforce to win the fight. Doesn't seem super competitive though.
- Invasion of Segovia: I'm kinda mad that this exists. The backhalf is so cool and would make an incredible commander or inclusion in the '99. But having to slog through that miserable front half to get it makes it feel way, way, way too unreliable to be practical. Probably gets played in Kasla, the Broken Halo anyways but man is this card frustrating.
- Invasion of Fiora: Seems like a miss to me outside of Battles.dec or Legends.dec. The front half is a pretty mediocre boardwipe that's gonna be hard to make asymmetrical in EDH; the back is interesting but also very, very slow. (This was also shockingly awful in limited).
- Invasion of Kaldheim: Something something Prosper, Tome-Bound and Faldorn, Dread Wolf Herald. This card is obviously good there although not great, as you need to have a hand of meaningful size (3+) for this to really pull its weight. Still a great candidate for those two, even totally ignoring the backside. This is less interesting for lands.deck compared to Seismic Assault and Molten Vortex since you have to jump through the hoop first, so I don't think those decks will be picking it up.
- Invasion of Regatha seems pretty terrible, since it's just Torbran, Thane of Red Fell with extra steps and 3 damage isn't enough. A strong standard hopeful and I'm sure a beating in limited; not good enough here.
- Invasion of Ikoria seems like the strongest of the rare battles, and one I anticipate seeing often. For just more than Green Sun's Zenith you get to go find any non-Human as opposed to any Green creature and it can fish for cards in your 'yard as well. The backside is mostly pure gravy at that point, but if you have a free moment to pop it Zilortha is a significant threat in his own right. Probably the only battle that promises to be a staple.
- Invasion of Ixalan is a lot less exciting but might actually be playable in some decks. It's a sorcery speed Once Upon a Time that can hit any card type and contributes to devotion, so that's not nothing. Still, Impulses are pretty mediocre in EDH and when Green runs them it tends to prefer the kind that mill like Winding Way. The backside is perfectly bland and ignorable, and I would scarcely bother to try and flip it. Probably playable in Standard?
- Invasion of Theros is functionally Azorius for EDH purposes, and seems very mediocre. The front half is just worse than Idyllic Tutor (since most Gods and all current Demigods are also enchantments), so you'd need to be deep into a God theme. The back side is a nice enchantress payoff, but I worry most enchantress decks will struggle to get this turned on in a reliable fashion and we're in an era of a ton of redundancy in enchantresses. I suppose if you are in Azorious or Esper enchantress, especially if you've got a God subtheme, it will see play but this is more for flavor and fun than power.
- Invasion of Tolvada:This is a near-strictly-better upgrade to Obzedat's Aid so it's got that going for it. Still, I find 5MV reanimation spells to be pretty disappointing most of the time and am not sure I'll be clamoring to add this to too many lists.
Mythics: With just six, I can look at them all too...
- Invasion of Ravnica: This hits like 80% of the top creatures in the format, it hits 65% of the format's top commanders, and it hits almost all artifacts, enchantments, and walkers (and battles). If you are just running Meteor Golem or Scour from Existence for removal without any synergy, this is near-strictly better...but those aren't all-stars necessarily either. Obviously much better if you are planning to flip the backside, so I suspect that General Ferrous Rokiric and Niv-Mizzet Reborn are interested in this.
- Invasion of Innistrad: Four is a ton for removal unless you're gonna get a four-fingered discount somehow, so even though this kills almost everything in the format it's too weak on the front. The backhalf is also pretty mediocre. Overall a miss, but I can testify this thing is a beating in limited.
- Invasion of Tarkir: The dragon players aren't listening and have already put this in their '99. If you are gonna reliably be able to reveal two dragons, this is fine if not particularly glamorous removal. Better in Izzet/Gruul/Temur dragons than anywhere else due to the lack of competition in the removal slot.
- Invasion of Shandalar: I take it back, this seems like the best invasion for EDH. The front half has no real direct analog - it'll generally be better than Wildest Dreams, Restock, Creeping Renaissance, and it comes in a turn ahead (or a mana off, a big deal with recursion) compared to Seasons Past and Greenwarden of Murasa. 4 damage also feels very fair to get a free self-only Show and Tell every upkeep. Good on the front, insane if flipped, this should get lots of play in big slow permanent heavy Gx decks.
- Invasion of Alara: This card is dumb and I'm not gonna talk about it.
- Invasion of New Phyrexia // Unknown Backside seems strong. We don't have a direct analog; I think it compares favorably to Secure the Wastes and White Sun's Zenith sitting right between those two mana value wise at sorcery speed for much better creatures. The back side is a fine Teferi if you can get it, and is worth hunting but not essential. Seems okay in UWx Knight or Token decks.