M20 cards you want so far?

[Judaspriester]

Kill Vilis, Endless Whispers gives it to opponent, once they draw a card and lose life from Whispers, that triggers Vilis and makes them draw another card to lose life and then another card to lose life, etc.

Edited to clean up wording

Ahh.. got it! nasty. 

[WWolfe]

I meant it makes them lose life from Underworld Dreams, which then starts the chain.

Not very awake yet this morning.

[Shredwick]

Yarok!  I've already got a foil preordered!

[Bizarro Soapy]

As a filthy casual, my want-list is:

Gargos, Vicious Warden (Hydra Tribal/one-of fun drop)
Sephara, Sky's Blade (Hokori EDH alternate payment methods)
Vivien, Arkbow Ranger (slots into my Standard GW Proliferate deck seamlessly)
Hanged Executioner (Orzhov Syndicate EDH)
Knight of the Ebon Legion (Vampire EDH)
Bloodthirsty Aerialist (Vampire EDH)
Vampire of the Dire Moon (Vampire EDH)
Voracious Hydra (Replaces Hungering Hydra in my Standard GW Proliferate deck)
Icon of Ancestry (just a great card for anyone who plays tribal anything)
Lotus Field (Another alternate mana source for my Hokori EDH)
Sorin, Imperious Bloodlord (another obvious pick for Vampire tribal)

Scrylands seem poop, Corpse Knight seems worse than Cruel Celebrant (which is worse than Blood Artist et al), Rotting Regisaur is a bit unconventional but actually not that good without trample.

Also, can someone explain how/why the Lavakin Brawler is wearing clothes!?

[Red_Wyrm]

As a filthy casual, my want-list is:

Gargos, Vicious Warden (Hydra Tribal/one-of fun drop)
Sephara, Sky's Blade (Hokori EDH alternate payment methods)
Vivien, Arkbow Ranger (slots into my Standard GW Proliferate deck seamlessly)
Hanged Executioner (Orzhov Syndicate EDH)
Knight of the Ebon Legion (Vampire EDH)
Bloodthirsty Aerialist (Vampire EDH)
Vampire of the Dire Moon (Vampire EDH)
Voracious Hydra (Replaces Hungering Hydra in my Standard GW Proliferate deck)
Icon of Ancestry (just a great card for anyone who plays tribal anything)
Lotus Field (Another alternate mana source for my Hokori EDH)
Sorin, Imperious Bloodlord (another obvious pick for Vampire tribal)

Scrylands seem poop, Corpse Knight seems worse than Cruel Celebrant (which is worse than Blood Artist et al), Rotting Regisaur is a bit unconventional but actually not that good without trample.

Also, can someone explain how/why the Lavakin Brawler is wearing clothes!?

[Xaarvaxus]

So far...

Yarok, the Desecrated
Kykar, Wind's Fury
Shared Summons
Sorin, Imperious Bloodlord
Dread Presence
Mu Yanling, Sky Dancer

[WWolfe]

I was looking at Yarok, the only problem with it is that the deck I have it would fit in doesn't have that many ETB effects, though the ones it does would be pretty beast with the double trigger.

[Red_Wyrm]

I was looking at Yarok, the only problem with it is that the deck I have it would fit in doesn't have that many ETB effects, though the ones it does would be pretty beast with the double trigger.

Yeah combined with constricting sliver would be vicious. But you're right, slivers don't have too many ETB effects.

Surprisingly enough you're talking about sidiisi though.

[WWolfe]

Yup, and there's only 6 ETBs in it. Don't feel like that's enough to warrant Yarok.

[Red_Wyrm]

Yup, and there's only 6 ETBs in it. Don't feel like that's enough to warrant Yarok.

Probably not. You could always completely rework sidisi to be a sultai good stuff deck that has big creatures with ETB effects

[WWolfe]

Yup, and there's only 6 ETBs in it. Don't feel like that's enough to warrant Yarok.

Probably not. You could always completely rework sidisi to be a sultai good stuff deck that has big creatures with ETB effects

Nah, I'm quite happy with my zombie tribal build (it use to be a more competitive build but wasn't very fun to play).

[Marshstepper78]

I'm hoping Gorging Vulture finds its place in my pauper BG Tortured Existence deck.

Mystic Forge, along with the WotS Karn and Ugin, is making me want to bring back my Karn, Silver Golem deck.

Colossus Hammer is hilariously stupid in Balan, Wandering Knight.

Manifold Key could very well replace most instances of Voltaic Key, unless a second Voltaic Key is needed.

However, it is my Haakon, Stromgald Scourge (black) knight tribal deck that is getting the greatest overhaul with Core 2020. Knight of the Ebon Legion and Cavalier of Night are perfect additions. Knight of the Ebon Legion is replacing Order of the Ebon Hand and Cavalier of Night is replacing my lone copy of Josu Vess, Lich Lord.

[Varatius]

Flood of tears only for my mono blue memnarch eldrazi edh deck as it will allow me to drop an eldrazi on turn 5 when I have it as I normally have 4-6 permanents out on turn 5 so I can easy cheat void winnower or emarkul

[Morganator 2.0]

So I've waited for the full spoiler to be released before making my post. It just makes things easier. Here are the cards that I want.

Vilis, Broker of Blood: 1 mana to draw two cards seems really powerful. Perhaps too powerful? We'll see.
Atemsis, All-Seeing: this looks like a hard commander to build. I might give it a try.
Leyline of Anticipation, Leyline of the Void: good reprints.
Leyline of Abundance: good new print. This could be very good in a lot of decks.
Veil of Summer: this is an interesting protection card. I'll have to try it out.
Chandra's Regulator: Pretty crappy card draw, but mono-red will take what it can get. I'm at least going to try it out in Krenko, Mob Boss.
Shared Summons: as an instant, you can use it on your opponent's end step to search for Kiki-Jiki, Mirror Breaker and Village Bell-Ringer (or any of the other creatures Kiki-Jiki combos with). I want to try it out, but I don't have a good deck for it right now.
Tale's End: hilarious flavor text, but I'm not sure how it will fare as a counterspell.
Scheming Symmetry: The design of this card is super cool. In cEDH, I'll have to think hard about which opponent I give the search to.

[WWolfe]

Corpse Knight seems worse than Cruel Celebrant (which is worse than Blood Artist et al),

It's the opposite effect which will work in a lot of Orzhov token decks, or a Varina token build. If it was Sultai colors I'd definitely want it for my Sidisi deck.

As for my final list of cards from this set I want...

Corpse Knight - will do some work in my Varina (wish it was Sultai for Sidisi)
Scheming Symmetry - not sure which deck but the political possibilies for this...
Voracious Hydra - just have a thing for hydras
Elvish Reclaimer - could do some work in a deck that has plenty of ways to bring lands back from the GY
Yarok, the Desecrated - if I had a deck that fit this I'd be ecstatic
Leyline of Abundance - could be absolutely dumb if I bring back my Rishkar deck
Shared Summons - will slide into my less competitive Animar build
Lotus Field - essentially a functional Lotus Vale reprint but with hexproof and the lands you sac don't have to be untapped