Alchemy Horizons: Baldur's Gate

Undersimplify

Undersimplify {1}{U}

Instant
Choose target spell. If it's a creature spell, it perpetually gets -2/-0. Counter that spell unless its controller pays {2}.
Water Weird

Water Weird {3}{U}

Creature - Elemental Weird
Whenever Water Weird deals combat damage to a player, put a +1/+1 counter on Water Weird if the top card of your library is a nonland card. Otherwise, you may mill a card.
{1}{U}: Water Weird gets +1/-1 until end of turn.
3/4
Wizened Githzerai

Wizened Githzerai {1}{U}

Creature - Gith Monk
Psionic Adept — Whenever Wizened Githzerai becomes blocked by a creature, that creature perpetually gets -2/-0.
2/1
Grave Choice

Grave Choice {2}{B}

Instant
Target opponent sacrifices a nontoken creature. If that creature had mana value 2 or less, conjure a duplicate of it into your hand. That duplicate perpetually gains "You may spend mana as though it were mana of any color to cast this spell."
Hook Horror

Hook Horror {4}{B}

Creature - Horror
Molting Exoskeleton — When Hook Horror dies, it perpetually gets -1/-1. Then if that card's toughness is 1 or greater, return it to the battlefield under its owner's control.
3/3
The Hourglass Coven

The Hourglass Coven {4}{B}{B}

Legendary Creature - Hag Warlock
When The Hourglass Coven enters the battlefield, draft a card from The Hourglass Coven's spellbook twice, then put those cards onto the battlefield.
Other Warlocks you control get +1/+1.
3/3
Related cards: Hag of Ceaseless Torment Hag of Dark Duress Hag of Death's Legion Hag of Inner Weakness Hag of Mage's Doom Hag of Noxious Nightmares Hag of Scoured Thoughts Hag of Syphoned Breath Hag of Twisted Visions
Mind Spike

Mind Spike {B}

Sorcery
Target opponent reveals each noncreature, nonland card in their hand. You choose a card revealed this way. That player discards that card. You lose 2 life. If they didn't reveal a card this way, you draw a card.
Sewer Plague

Sewer Plague {2}{B}

Instant
Target creature an opponent controls perpetually gets -2/-2 and gains "At the beginning of each upkeep, this creature perpetually gets -1/-1."
Stroke of Luck

Stroke of Luck {1}{B}

Sorcery
Look at the top four cards of your library. Choose one of them and put all cards with the same name as the chosen card from among them into your hand. You lose 1 life for each card put into your hand this way. Put the rest on the bottom of your library in a random order.
Chaos Balor

Chaos Balor {3}{R}{R}

Creature - Demon
Flying
Whenever Chaos Balor attacks or dies, choose two. Each mode must target a different player.
• Target player discards all the cards in their hand, then seeks that many nonland cards.
• Chaos Balor deals 2 damage to target player and they create two Treasure tokens.
• Chaos Balor deals 2 damage to each creature target player controls. Those creatures perpetually get +2/+0.
4/5
Craving of Yeenoghu

Craving of Yeenoghu {2}{R}

Enchantment - Aura
Enchant creature you control
Enchanted creature gets +3/+2, has haste, and attacks each combat if able.
{R}: Return Craving of Yeenoghu from your graveyard to the battlefield attached to target creature you control. Craving of Yeenoghu perpetually gains "Enchanted creature gets -1/-1." Activate only as a sorcery.
Dragonborn Immolator

Dragonborn Immolator {3}{R}

Creature - Dragon Shaman
{1}{R}: Dragonborn Immolator gets +1/+0 until end of turn.
Gift of Tiamat — When Dragonborn Immolator dies, note its power. You get a boon with "When you cast your next creature spell, it perpetually gets +X/+0, where X is the noted number."
2/4
Flames of Moradin

Flames of Moradin {2}{R}{R}

Sorcery
Destroy up to three target artifacts. Conjure a duplicate of each nontoken artifact destroyed this way into your hand. The duplicates perpetually gain "You may pay {R} rather than pay this spell's mana cost" and "At the beginning of your end step, sacrifice this artifact."
Genasi Rabble-Rouser

Genasi Rabble-Rouser {1}{R}

Creature - Elemental Shaman
Double team
{1}{R}: Creatures you control named Genasi Rabble-Rouser get +1/+0 until end of turn.
1/3
Giant Fire Beetles

Giant Fire Beetles {2}{R}

Creature - Insect
Menace
Double team
2/2
Gnoll Hunting Party

Gnoll Hunting Party {5}{R}

Creature - Gnoll
This spell costs {1} less to cast for each creature you attacked with this turn.
Double team
As long as it's your turn, Gnoll Hunting Party has first strike.
4/4
Goblin Trapfinder

Goblin Trapfinder {R}

Creature - Goblin
When Goblin Trapfinder dies, seek a creature card with mana value 3 or less. That card perpetually gains haste, "This spell costs {1} less to cast," and "At the beginning of your end step, sacrifice this creature."
1/1
Incessant Provocation

Incessant Provocation {3}{R}

Sorcery
Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. It perpetually gains "This creature attacks each combat if able."
Kardum, Patron of Flames

Kardum, Patron of Flames {2}{R}{R}

Legendary Creature - Demon
Haste
Whenever Kardum, Patron of Flames attacks, put a flame counter on it, then seek a card with mana value equal to the number of flame counters on it and exile that card face down.
When Kardum dies, put all cards you own exiled with it into your hand. At the beginning of the end step of your next turn, discard those cards.
4/3
Kobold Warcaller

Kobold Warcaller {R}

Creature - Kobold
{T}: Choose a creature card in your hand. It perpetually gains haste.
1/1
Mephit's Enthusiasm

Mephit's Enthusiasm {1}{R}

Sorcery
Mephit's Enthusiasm deals 4 damage to target creature or planeswalker. If excess damage was dealt this way, note that excess damage, then you get a boon with "When you cast your next creature spell, it perpetually gets +X/+0, where X is the noted number."
Tiefling Outcasts

Tiefling Outcasts {R}

Creature - Tiefling Peasant
Double team
Other Demons, Devils, Imps, and Tieflings you control get +1/+0.
1/1
Unexpected Allies

Unexpected Allies {1}{R}

Sorcery
Target nontoken creature you control gets +2/+0 and gains double team until end of turn. It also gains first strike until end of turn if it has the same name as another creature you control or a creature card in your graveyard.
Uthgardt Fury

Uthgardt Fury {1}{R}{R}

Enchantment
When Uthgardt Fury enters the battlefield, it deals 4 damage to any target.
Damage isn't removed from creatures your opponents control during cleanup steps.
Warriors of Tiamat

Warriors of Tiamat {4}{R}

Creature - Dragon Warrior
Haste
Double team
4/2