The most hyped card in THB is [[Uro, Titan of Nature's Ramp]].

The obvious shell for this is Simic Ramp, but I found it underwhelming there -- it's hard to have enough cards in the graveyard to escape, let alone on T4.

Henge Card Advantage / Self Mill

The "Henge pile" self-mill deck is a list first built by Ondrej Strasky. It was competitive but tier 2 in ELD standard, especially folding to rakdos aggro. If you want examples of the ELD list in action, go watch Ondrej's old streams.

The List:

This shell seems like the most natural fit for Uro. Here is my sultai list

Update: Here is a much better bant list.

The deck looks to overwhelm the opponent with card advantage and optionally win by decking yourself.

Why does the deck exist? It maximizes one of the most powerful cards in standard. The deck can mill itself out and win by turn 9 or 10. It wins all grindy games due to lifegain, clogging up the board, living through sweepers and having a very reliable alternate win condition.

It's well positioned against the two new popular builds: mono white devotion can't trample over our clogged board. Monoblack can give some trouble game 1, but post sideboard we can dismantle their gameplan and have a huge edge.

What does it do well? It's hard to disrupt. It attacks from graveyard recursion, card advantage and playing lots of cheap creatures. It also wins all grindy matchups by avoiding the board entirely and winning through [[thassa's oracle]]. The sultai shell can sideboard into lots of good disruption, dismantling devotion and aggressive decks post sideboard.

The deck's problem is if can't get started by turn 4. If you can't land Uro or [[The Great Henge]] on T5, either by not finding them, or by getting disrupted out of them, you can run the deck out of gas and lose by lack of tempo. Also, against very aggressive decks, you need to mulligan carefully to survive until you set yourself up, which can lead to losing game 1.

It's possible to build the sideboard to board into a flash deck, between Brazen Borrower, [[frilled mystic]], necrotic would, etc.

Card Discussion:

The entire bant shell I posted above is pretty tight, though it can still be optimized. The sideboard will settle with the meta.

• Core Shell is [[Merfolk SecretKeeper]], [[Edgewall Innkeeper]], [[Emry]], [[Uro]], [[Great Henge]], [[Lovestruck Beast]] and [[Brazen Borrower]].

• Knight of Autumn is the new FTK in this meta. Run him maindeck and rejoice. Other proactive disruption is [[Giant Killer]] and [[Glass Casket]] (recursive with Emry).

• [[Thassa's Oracle]] is our win condition. We try to be thin on her (2 is good) as she doesn't do all that much otherwise. The win condition used to be [[Jace, Wielder of Mysteries]], but it's inferior overall. The deck spends all of its mana on every turn, and a 1UUU planeswalker is a steep cost, especially if we're tight on mana looking for the win condition on T9 or so.

• [[Wand of Vertebrae]] is the win condition insurance. This used to be [[Tamyio, Collector of Tales]], which ran into the same issues as Jace vs Thassa's Oracle. Another option is [[Order of Midnight]] in sultai, but he can't be recursed with [[Emry]] and isn't too useful otherwise.

• Good 5 drop options include Chulane and [[Dream Trawler]] in bant, and Underrealm Lich in sultai.

• On Mana: we always want to run 4 fabled passage, because it helps recursing Uro. This is because it's an extra card which brings the graveyard total from 4 to 5 if you player secretkeeper or Emry previously, landing much more consistent T4 Uro. Passage also thins the deck for self-mill. You shouldn't worry about running out of basic lands -- by the point at which this is an issue, you should already be well on your way to win.

Sideboard Guide

First thing, this deck runs 25-27 lands. If you lose game 1 (you'll be on the play), or if you board out copies of Uro, you can board out one land.

MonoBlack Devotion

Here we want to disrupt their gameplan then win by card advantage. Board in knight of autumn, glass casket, giant killer. Board out chulane, one uro, one Thassa's Oracle and one land.

Monowhite and other aggro (rakdos, cavalcade, etc.)

Same sideboarding as monoblack.

Jeskai Fires:

Cavaliers are at the annoying 5 toughness point. Board in Knight of Autumn, Borrower, giant killer for cavaliers. Board out Lovestruck Beast and glass casket.

Simic Ramp:

Board in counterspells, glass casket (hits mana, nissa lands and krasis), giant killer. Board out Knight of autumn. If this becomes a huge part of the meta, we'd build the sideboard to have better hate for it.