Yeehaw!

Instant
Spree
- Attacking creatures get +1/+1 until end of turn
- Untap all attacking creatures
- Attacking creatures gain Horsemanship until end of turn.

Tetsuko, Omenpath Escapist
Legendary Creature — Human Rogue (U)
Whenever you commit a crime, you may exile Tetsuko, Omenpath Escapist. If you do, it becomes plotted.
"The dragon is dead? Yeah, we all thought that before."
3/1

Beauty
Legendary Creature - Horse Mount (R)
Saddling Beauty is a crime.
Whenever Beauty attacks, if you commited a crime this turn, it gains menace and deathtouch and becomes a Nightmare in addition to its other types until end of turn.
Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
4/4

Heiko, Asari Exile
Legendary Creature — Human Samurai
Trample
Samurai and Warriors you control are outlaws.
Whenever an outlaw you control attacks alone, you gain control of target artifact until end of turn. If it's an Equipment, you may attach it to that outlaw. (It's too late to attack with it this combat.)
3/3

Juicy Cactus
Creature - Plant (C)
Defender
: Add
: Add . Juicy Cactus deals 1 damage to you.
1/2

Judith, Show on the Road
Legendary Creature — Human Shaman
Haste, first strike
Whenever Judith, Show on the Road attacks, you may exile three nonland cards from your hand. If you do, choose one of those cards at random and it becomes plotted. Whenever a creature card isn't chosen this way, create a 1/1 black Mercenary creature token with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery.” Whenever a noncreature card isn't chosen this way, Judith deals 1 damage to any target.
3/1

Rider's Wide-Brimmed Hat
Artifact — Equipment
Equipped creature gets +1/+1 and has ward
: You and target opponent each create a Treasure token. Activate this ability only if Rider's Wide-Brimmed Hat is attached to a creature.
Equip
No words need pass for a kind regard.

Freestriders' Oasis
Land — Desert
: Add .
: Add one mana of any color. Activate this ability only if you committed a crime this turn.
Some see freedom as an opportunity to indulge in one's worst impulses. Some see freedom as an opportunity to leave behind one's worst self.

Next is miscellaneous Magic planes

Ramosian Retribution —
Kindred Instant — Rebel (U)
Destroy target tapped creature. Recuit X for a Rebel, where X is the amout of combat damage it dealt this turn. (Search your library for a Rebel card with mana vaue X and cast it without paying its mana cost, then shuffle.)

Reformed from the Waters
Instant
The next time you would lose the game this turn, your life total becomes equal to the number of cards in your hand instead. Then, shuffle any number of cards from your graveyard and/or hand into your library. For each card you shuffled from your hand this way, draw a card.
Ugin knew this was not his fight and allowed his brother to strike a killing blow. The waters of the Meditation Plane will be his salvation.

Shadow Creed Teachings
Enchantment — Class
When Shadow Creed Teachings enters the battlefield, return up to two creature cards from your graveyard to your hand.
: Level 2
, Discard a card: The next time target creature you control would die this turn, return it to its owner's hand instead.
: Level 3
, Sacrifice another permanent: Draw a card.

The Shadow Creed is from Zhalfir (Shadow Guildmage), which is now its own plane.

Naar Isle Hellkite
Creature - Elemental Dragon (R)
Flying
: Naar Isle Hellkite gets +1/+0 and deals 1 damage to each creature and each player. Any player may activate this ability.
Wildfire's fury dragonified.
6/6

Kylem

Seeded Matches
Sorcery
Team-up — When you cast this spell with one mode, you may have another player cast this spell with the other mode.
Choose one—

• Target creature you control fights target creature an opponent controls.
• Search your library for a basic land card, reveal it, put it in your hand, then shuffle.

The fruit of hard training is sweet.

Mercadia

Kyren Whisper Network
Creature - Goblin Spellshaper
, , Discard a card: Create a Conspiracy token.
The elite of Mercadia City are part of more schemes than they can remember.
2/2

Elders of Equilor
Creature — Spirit Advisor
When Elders of Equilor enters, if you've drawn twenty or more cards this game, double your life total and the number of experience counters you have.
When Elders of Equilor leaves the battlefield, if you've drawn forty or more cards this game, each opponent loses half their life total, rounded up.
1/1

Keral Keep
Land
: Add . Spend this mana only to cast instant, sorcery, or Elemental spells or to activate abilities of instant, sorcery, or Elemental sources.
: Exile the top card on your library card. Until end of turn, you may cast that card if it's an instant, sorcery, or Elemental card by sacrificing this land in addition to paying its costs.

Next is Universes Beyond, but I'm okay if we play that by ear, like if the first person to go wants to skip it to go back to the beginning of the list.

Bloomburrow can also be added to the list.

Universes Beyond

Joshua Graham, The Burned Man
Legendary Creature — Human Soldier Cleric
Enrage — Whenever Joshua Graham is dealt damage, exile up to that many cards from your graveyard.
Whenever one or more cards are exiled from your graveyard, put a faith counter on each of those cards. Support 1.
Whenever Joshua Graham deals combat damage to an opponent, if the number of cards you own in exile with a faith counter is equal to or greater than your starting life total, you win the game.
2/8

Akhelian Leviadon
Creature - Turtle (R)
Ward
Void Drum — As long as Akhelian Leviadon is untapped, other creatures you control have Ward .
Crushing Charge — Whenever Akhelian Leviadon attacks, target creature blocks this turn if able.
7/7

Maximus, Brotherhood Squire
Legendary Creature — Human Soldier
: If Maximus is a Soldier, put a +1/+1 counter on him and he becomes a Human Berserker with haste and double strike until end of turn.
: If Maximus is a Soldier, put a +1/+1 counter on him and he becomes a Human Citizen with hexproof and indestructible until end of turn.
: If Maximus is a Soldier, put a +1/+1 counter on him and he becomes a Human Knight with lifelink and vigilance until end of turn.
: If Maximus is a Soldier, put a +1/+1 counter on him and he becomes a Human Rogue until end of turn. Attach target Equipment to him.
1/1

Slap Juice
Enchantment - Aura (U)
Enchant creature you control
Enchanted creature has haste.
: Untap enchanted creature.
At the beginning of the end step, sacrifice Slap Juice.