Flame-Horned Believer
Creature — Minotaur Warrior
Trample
When Flame-Horned Believer enters the battlefield, discard your hand then draw a number of cards equal to its power.
Eternalize
1/3

New-Crop Cultivator
Creature — Naga Druid
: Add a number of equal to New-Crop Cultivator's power.
Eternalize
1/1

Ruinous Sandstorm —
Sorcery (R)
Search your library for a Desert card, put it onto the battlefield, then shuffle. Ruinous Sandstorm deals damage to each creature and each player equal to the number of Deserts you control.

Talisman of Trials-
Artifact
Whenever you cast a Cartouche spell, copy it. You may choose new targets for the copy.
"To die before your Gods is not to die at all, but to live eternal in their service."~Talisman inscription

Desiccated Oasis
Land — Desert (R)
When you have spent at least to cast spells this turn, put an oasis counter on Desiccated Oasis. It's not a Desert.
: Add one mana of any colour. If Desiccated Oasis is a Desert, add instead.

Next is Ixalan.

This is applying the level-up mechanic to +1/+1 counters.
This creature has lifelink as long as it has zero, one, or two +1/+1 counters on it.
It loses lifelink and replaces it with flying when it has four or more +1/+1 counters on it.

Reverse the Flow
Instant
Counter target spell. If or was spent to cast this spell, Reverse the Flow deals 1 damage to that spell's controller and you create a tapped Treasure token. If was spent to cast this spell, put a +1/+1 counter on a creature you control and it gains hexproof until end of turn.
River or sea, water hides as much as it reveals, takes as much as it gives.

Brazen Scallywag
Creature - Goblin Pirate
When ~ enter the battlefield, create a tapped Treasure token unless an opponent discards a card.
"I have to admit the kid has guts, and even when those blasted Legion bastards catch him, he always manages to give them hell!" - Admrial Beckett Brass.
[1/1]

Search for Orazca
Sorcery
Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. If was spent to cast this spell, draw a card. If or was spent to cast this spell, creatures you control get +1/+1 and gain haste until end of turn.
Orazca was hidden for the greater good and now it must be found to preserve that good.

Challenge Authority
Instant
Counter target spell. Permanents that spell's controller controls lose ascend. If that player has the city's blessing, they lose it.

Spitfire Bombard

Artifact (U)

, : Spitfire Bombard deals 2 damage to target attacking creature.
, : Destroy target attacking Vehicle.

Spitfire Bastion is surrounded by the wreckage of failed assaults -- or, as far as its owner is concerned, successful target practice.

Dinosaur Nest
Land
When Dinosaur Nest enters the battlefield, create a 0/1 colorless Dinosaur Egg creature token.
: Add .
, Sacrifice an Egg: Add one mana of any color. Spend this mana only to cast Dinosaur spells.

Next is Shandalar.

Dust the Cobwebs
Instant (C)
Handy 1 (You may cast this spell without paying its mana cost if you cast one other spell that shares a color with it this turn.)
Exile target artifact or enchantment.
Those responsible for keeping the domes of Thune in such impeccable condition do not relish the idea of not having magic to help.

Reverse Time

Sorcery (U)

Each player returns a land they control to its owner's hand, then puts a card from their hand on top of their library.

"We will do this as many times as it takes until you get it right."

Lim-Dûl’s War
Enchantment — Saga
Read ahead
I - Create two 2/2 black Zombie creature tokens.
II - Each player sacrifices two creatures.
III - Each opponent discards two cards.
Unearth

Onakke Ritual
Instant (U)
Add . If this mana is used to cast an artifact or Ogre spell this turn, return ~ to your hand at the beginning of your next upkeep.

Tusk Sliver
Creature - Sliver (R)
Sliver creatures you control have "When this creature leaves the battlefield, create a 3/3 green Beast creature token."
"We're gonna need more spears."
—Mokgar, Kalonian hunter
3/3

Anguish Sliver
Creature - Sliver (R)
~ and other slivers you control have "When this permanent enters the battlefield, exile target nonland permanent unless its controller pays 3 life."
"This new subspecies is both remarkable and horrifying. Instead of simply consuming their prey, these slivers actually 'dismantle' them to better understand and thus adapt their hunting strategies."
[2/3]

Honestly I should give Slivers more of a chance

Sunpetal Signet

Artifact (U)

Sunpetal Signet enters the battlefield tapped unless you control a Forest or a Plains.
: Add or .

Ardestan, The Last City
Land
When Ardestan enters the battlefield, each opponent creates a 2/2 black Zombie creature token. Then, you scry X, where X is twice the number of opponents you have.
: Add .
: Add one mana of any color. Activate this ability only if you have two or more opponents.

Next is Fiora