CHANGELOG:

9/30 - Made small tweaks to manabase for early game consistency, tweaked removal and removed Paradise Druid to focus on putting more impactful cards in the deck.

This deck seeks to blend the best of Golgari Stompy and Dimir Reanimator into a flexible, fun deck that relies on linking several powerful synergies together. You will BURN through your deck, so beware of mill! We have a limited Risen Reef elemental package for card advantage and ramp as well as graveyard fillers like Cavalier of Thorns to help set up our new toy: Cauldron of Eternity. Yarok, the Desecrated serves as a general amplifier of the power of this deck, either accelerating our elemental package, pissing our opponent right off with Agent of Treachery, or making The Great Henge into a card drawing machine.

Feel free to post in the comments any suggestions on how you would tune the deck! I'm just having fun tweaking and experimenting with more Eldraine cards.

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Card Selection:

4x Risen Reef 

4x Leafkin Druid

Risen Reef and Leafkin Druid create a reliable ramp and draw tool for us in the early game, and continue to provide card advantage even into the late game. With a Henge in play, Risen Reef means every elemental will net at least 2 cards per entrance into the battlefield (with a Yarok that is 4 cards per elemental entrance). If you have built up a significant enough manabase by the later game, hold your Leafkins in hand until you can drop them with either a Risen Reef or Henge in play and use them for card advantage.

4x The Great Henge

2x The Cauldron of Eternity

3x Yarok, the Desecrated

The heart of our deck, these artifacts provide us with immense card advantage and versatility. The Great Henge paired with Risen Reef can lead to a quickly ramped and flooded board as well as a full hand. The Cauldron of Eternity is especially powerful against removal-oriented decks, as it allows us to recur for 3 mana any creature in our graveyard. Upon re-entering the battlefield, these creatures trigger The Great Henge, leading to even more advantage. Yarok provides us 2 procs of Henge for each creature, meaning every creature entering the battlefield gets +2/+2 and lets us draw 2 cards. Yarok, of course, makes Risen Reef more potent as well. DON'T MILL YOURSELF! ;)

4x Questing Beast

An unreal threat, has haste damage, removes Planeswalkers, blocks big threats. When returned to the battlefield with Cauldron of Eternity, he can attack straightaway with haste. An important on-curve accelerant for Great Henge.

2x Cavalier of Thorns

Feeds our graveyard to cheapen Cauldron, and provides us with an excellent body. Elemental synergy is a bonus. Upon death lets us place an impact card on top of our deck, often one of our legendary artifacts so we can set our engine back up after a Planar Cleansing.

3x Murderous Rider

Versatile removal that is immune to Duress; creature body helps stave off aggro decks with lifelink and provides us more creatures to pair with our legendary artifacts.

2x Agent of Treachery

An obvious reanimate target for Cauldron, this list will often be able to hard cast Agent due to its aggressive ramp.

4x Lovestruck Beast

Turn one nerd to block against aggro, turn 3 thicc boi to block even harder with, and just maybe swing with too. Risen Reef gives us a set of 4 other 1/1 creatures, so the beast has the potential to swing in. Most importantly, a 5 power creature on turn 3 really helps accelerate our Henge out on turn 4.

2x Legion's End

Put these in to replace Tyrant's Scorn to help with early game manapool (we really need early green for our other cards) and because of how many Cauldron Familiars I have seen recently. Certainly swappable for your cheap removal of choice: Tyrant's Scorn, Epic Downfall, or Ob Nixilis's Cruelty are viable alternatives. If you swap, keep Legion's End in your sideboard because people are still playing Field of the Dead and it can wipe out some pesky Dance of the Manse Shenanigans.

Sideboard:

FOR SIMIC FLASH:

Add 2x Veil of Summer ; 3x Shifting Ceratops ; 3x Ob Nixilis's Cruelty ; 2x Duress

Sub 2x Legion's End ; 3x Murderous Rider ; 1x Yarok, the Desecrated ; 1x Questing Beast ; 1x Lovestruck Beast ; 2x Agent of Treachery

This has been my preferred sideboard plan for simic flash decks. You still need to be careful to play around their counters and attempt to bait them out. This is not an easy matchup (unless you get an on-curve Ceratops, then they will have only two possible blockers (Ambusher or Wildborn Preserver), but it is a very winnable matchup. You cannot keep a passive starting hand, you must mulligan into aggressive plays. Prioritize putting threats on the board over building your card draw engine (Questing Beast and Ceratops will be the cards that most often win you the game). If you can get Cauldron to hit the battlefield, you will be able to turn all those beasties they countered into cheap, efficient threats.

Ceratops is also an important sub in matchups where we need speed and bodies, and can come in for the Cauldrons and Cavaliers if we do not need to fear opponent removal (like against a Green Stompy deck, a Cavalcade of Calamity list, or against Azorius Fliers--remember Ceratops can gain reach!).

The other removal is meant to be matchup specific:

Duress is Duress. Save yourself. Put 4 in against every control deck.

Cry of the Carnarium helps against azorius fliers and cavalcade lists, and sometimes is lucky enough to exile a certain black cat.

I had been running The Elderspell for planeswalker heavy decks utilizing Fires of Invention, but swapped to Thrashing Brontodon because it can take out those key enchantments while be flexible enough to be played in other matchups. Since we don't run planeswalkers, some of the power of the elderspell is lessened for us. Brontodon is super good against Fires of Invention, Cavalcade of Calamity, and Danse of the Manse lists (Doom Foretold is a meme).

Ob Nixilis's Cruelty is meant for both Izzet Phoenix as well as decks using that stupid (and adorable) Cauldron Familiar + Witch's Oven loop. I also tend to sub this card in for Murderous Rider when up against Simic Flash as we don't need the Rider's planeswalker flexibility or to pay 2 life when this instant removal will remove an end-of-turn flashed-in creature just as well.