It's looking like I'll continue to play Nexus till rotation. Main reason is inertia. Learning another deck takes time & wildcards that I can't really be bothered investing. Besides, Nexus does do something powerful.
Soooo ... notes:
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Arboreal Grazer is surprisingly good. When you need to goldfish as fast as possible it's one of the better draws. It also stops random creatures such as Paradise Druid, Deputy of Detention, or even Field of the Dead Zombies from attacking your planeswalkers. I can easily see it as a 3-of somewhere in the 75.
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Mu Yanling, Skydancer was surprisingly poor. If you are forced to play your wincon before comboing, you'd prefer if it helps you stall to the combo. Mu Yanling does do this, but only if played on turn 3. Against aggressive decks, by turn 5 for example, she's going to die anyway unless you have Root Snare. If you also have that then there's a good chance she'll survive (since playing the two cards only costs 5 mana), but even if she lives she's not actually that good - making a 4/4 that might still not buy you a turn. Callous Dismissal does this better.
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Nissa, Who Shakes the World has been surprisingly good. If she survives, the mana boost is tremendous. Of course surviving isn't easy, but she does untap a land, and if you have a Breeding Pool lying around somewhere then she effectively lets you hold up Root Snare as well (+ Negate postboard). She can perform Shifting Ceratops' role of attacking planeswalkers, and ticking up to 6 also means she's hard to burn out. Definitely considering a singleton copy of it in the maindeck.
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Narset, Parter of Veils has also been surprisingly good, now that I look at her differently. Even if you can't activate her twice, she's an
Impulse that gains you some life, which is acceptable. In fact her very presence forces the opponent to attack her, unlike Tamiyo (who can reasonably be ignored to present a 1-turn faster clock). Later in the game if you are still searching for the combo she's a better draw than Mu Yanling.
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Jace, Wielder of Mysteries has been meh. I've yet to cast him before comboing. He just doesn't impact the board.
I have been playing Ondrej Strasky's version (
https://www.mtggoldfish.com/deck/2199792#paper) with Search for Azcanta instead of Anticipate (a mistake on my part, didn't netdeck properly). It's OK, but has not been discernibly better than the GP Denver list. One thing I like about it though is the 28 lands - Nexus wants to make tons of land drops, and having this many is great.
I'll tweak the deck a bit more. Arboreal Grazer might be the missing piece against Vampires. That matchup will never be good, but I'm OK with 40%.