Flavor Game

Dog Ambush: Compared to Thatcher Revolt you get a similar effect with instead of and Hound instead of Human (an arguably more relevant creature type). Because of the creature type difference and the double I think this card is balanced enough. You also exile the tokens instead of sacrificing them (like you do with Thatcher Revolt), so effects that trigger off creatures dying won't trigger off your Hounds being exiled. Nicely done. 10/10

Spiral into Insanity
Sorcery
Excavate 3 (Draw 3 cards from the bottom of your deck).
If ~'s madness cost was paid, draw a card instead.
Cycling , Madness , Transmute
"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents."
- H.P. Lovecraft

Next: "What's the difference between a taxidermist and a tax collector? The taxidermist takes only your skin." - Mark Twain

~Zuty

UP: A bit convoluted in its own design, but the concept is solid and creative. The flip side needs some heavy re-wording, look at Sengir Vampire (Whenever a creature dealt damage by ~ this turn dies, X). I'd recommend taking another whack at it, cutting down on the spread of colors and abilities, and focusing more on the flavor of lawkeeping/accounting. Your use of Azorius guild mechanics and flavors are on-spot.

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Lover's Quarrel 

Instant

As an additional cost to cast ~, tap up to three creatures you control.
Draw cards equal to the number of creatures tapped to cast ~, then discard a card.

“Man is the only animal that blushes, or needs to.”
  - Mark Twain

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Next: "I didn't expect it to be so... _______"

(You can fill in the blank I left. Get creative!)

UP: CCM 2 2/2 with an upsize it seems okay with the menace, but the growth ability can get out of hand too fast. Not sure what environment this card is in, but if it is not removed it can become like Pack rat and be extremely oppressive. Specially due to the evasive ability. It starts like a Yahenni and Blood Artist mix, becoming something like Desecration Demon later on the game. The Menace just takes up blockers if you want to kill it in combat first, then later becomes a self growing ability. I do not know if you can tell, but I cannot really make up my mind on the card. It seems pushed but not too much. Maybe it is pushed just enough. I know though it is pretty snowbally, more of a win more card once it gets started.

Revelation at the Grave   
Sorcey   
Your life total becomes 1.
Exile your hand and library.
At the end of your next upkeep, you win the game.

Sure, why not make an impossible win condition.
Edit: Due to complexity, making it a previous iteration of what I had in mind.

Next:
“How did it get so late so soon?”

― Dr. Seuss

Is there a rule about posting semi-consecutively? I mean, I cannot reply my post, but can I reply the reply of my post?

UP: Well somewhat improved Scavenging Ooze? The loss of the life gain makes it lose versatility though. As Scavenging Ooze can be played against burn decks. Follows the flavor very well though and is an interesting design. 7/10


Heat Up the Mixture  
Instant   
Counter target instant or sorcery. If you do, its controller reveals the top card of his library until he reveals an instant or sorcery card. They may cast that card without paying its mana cost.
"How could I have known that a small change to the potion could do that?"

NEXT: "I would pluck a star from the sky and gift it to you."


Edit: Drats, forgot that. It is now a better polymorph for spells.

Up: This either ends games or grinds them to a halt. That being said, it’s a good representation of Gluttony and definitely shows hunger getting what it wants.

Circle of Life
Enchantment — Aura
Enchant creature
If enchanted creature would die, instead search your library for a basic land card, put it onto the battlefield tapped, then shuffle enchanted creature into your library.
”Dead? That’s open to interpretation.” — Cevraya, Golgari shaman

Next: ____ had always hated ____.

Previous: Heh. I like this design, but I'm not sure what kind of deck you'd put it in. With a drawback like that, I could see that P/T being higher.

Refute Repetition -
Instant -
Return target spell to its owner's hand, then return Refute Repetition to its owner's hand if another spell of the same name has been cast this turn.
"Do you know the definition of insanity? I do."

Next: Alone, godless, the cat healed itself with its tongue.

Up: Interesting idea and a good design, but I think it's a bit overcosted. Pobably at  or even  would be fine, beacuse it isn't a "hard conter".

Oketra's Lynx 
Creature - Cat (Instert Hour of Devastation set icon here.)
Whenever a creature becomes blocked by a creature you control you gain 2 life.
Alone, godless, the cat healed itself with its tongue.
1/3

Next: "My name is _______. You killed my father. Prepare to die."

Up: Might have been more fun as a creature, but hard to argue with a white creature removal cantrip.

Grave of Heroes 
Legendary Creature - Ooze 
When Grave of Heroes enters the battlefield, exile a creature you control.
Whenever a creature dealt damage by Grave of Heroes would be put into a graveyard, exile it instead.
Grave of Heroes power and toughness are equal to the total power and toughness of all creatures exiled by Grave of Heroes.
One by one, they stood against a creature they had no hope of beating. And one by one, they became a part of it.
*/*

Next: All good things must come to an end. Bad things, not so much.

UP: It's always nice to see Devotion get more love, and I think it's good that Gehenna can so easily pump up your other black creatures. Problem is, you haven't given Gehenna a P/T value, even though she can become a creature. Also, I worry that she's too hard to remove from the board--but that might tie into the flavor text? You know what, let's go with that. All is well.

EDIT: Since Evil Coco (Lydia Deetz) clarified Gehenna's text, I'm going to re-review it. I... truthfully, I understand it less now? If she's always a 0/0 that can't attack or block, why would you want her to be a creature? Is it purely for, like, "number of creatures you control" synergy? Because Black doesn't have a whole lot of those.

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Bloodstained Bulwark
Enchantment
Creatures you control have indestructible.

At the beginning of your end step, sacrifice a creature. If you can't, sacrifice Bloodstained Bulwark and it deals 5 damage to you.

In his foolishness, what the young knight had given to the woman in black in exchange for the power to protect the ones he loved, were the very ones he wished to protect.

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Challenge: It is said that when the gods first walked upon the soil, there the lotus began to bloom.

Also, yes, you can sacrifice an indestructible permanent. I checked. Indestructible only prevents effects that use the specific word "destroy".

Up: Even at that cost, I'm not sure how balanced turning every land into a reusable Black Lotus is. It's definitely one way to hurry along the end of a game that's gone on too long, though. On the other hand, with some good ramp and X-spells... *laughs in G/R*

Anyways, no next flavour text, so I guess mine has none.

Unstable Energies
Enchantment
Cumulative upkeep — Target player creates a land token with ": Add ."
During each player's end step, if they control ten or more lands, they lose the game.
Lands have ", Sacrifice this land: Add one mana of any color to your mana pool."


Next: Strange is the night where black stars rise, And strange moons circle through the skies — The King in Yellow, Act 1, Scene 2

Up: I think this card would have fit more as a black card instead of a colorless.

Haphazard Reveller 4BR
Creature - Demon {Rare}
Flying
At the beginning of your upkeep, destroy target creature chosen at random.
"Huh, that is a shame...Oh well."
Watermark: Rakdos
4/4

Next: Some assembly required.