The Brothers' War

Arms Race | Enchantment | | {3}{R}: You may put an artifact card from your hand onto the battlefield. That artifact gains haste. Sacrifice it at the beginning of the next end step. | Leesha Hannigan

The Fall of Kroog | Sorcery | | Choose target opponent. Destroy target land that player controls. The Fall of Kroog deals 3 damage to that player and 1 damage to each creature they control. | David Auden Nash

Giant Cindermaw | Creature | Dinosaur Beast | Trample Players can't gain life. | Edgar Sánchez Hidalgo

Horned Stoneseeker | Creature | Lizard | Menace When Horned Stoneseeker enters the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") When Horned Stoneseeker leaves the battlefield, sacrifice a Powerstone. | Eric Velhagen

Mishra, Excavation Prodigy | Legendary Creature | Human Artificer | Haste {1}, {T}, Discard a card: Draw a card. Whenever you discard one or more artifact cards, add {R}{R}. This ability triggers only once each turn. | Donato Giancola

Monastery Swiftspear | Creature | Human Monk | Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) | Gabor Szikszai

Obliterating Bolt | Sorcery | | Obliterating Bolt deals 4 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead. | Campbell White

Pyrrhic Blast | Instant | | As an additional cost to cast this spell, sacrifice a creature. Pyrrhic Blast deals damage equal to the sacrificed creature's power to any target. Draw a card. | Raf Kayupov

Sardian Cliffstomper | Creature | Minotaur Barbarian | As long as it's your turn and you control four or more Mountains, Sardian Cliffstomper gets +X/+0, where X is the number of Mountains you control. | Joseph Weston

Fallaji Vanguard | Creature | Human Soldier | First strike Whenever Fallaji Vanguard or another creature enters the battlefield under your control, target creature gets +2/+0 until end of turn. | Joshua Cairos

Third Path Iconoclast | Creature | Human Monk | Whenever you cast a noncreature spell, create a 1/1 colorless Soldier artifact creature token. | Manuel Castañón

Junkyard Genius | Creature | Human Artificer | When Junkyard Genius enters the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") {1}{B}{R}, Sacrifice another creature or artifact: Until end of turn, other creatures you control get +1/+0 and gain menace and haste. | Rémi Jacquot

Arbalest Engineers | Creature | Human Artificer | When Arbalest Engineers enters the battlefield, choose one — • Arbalest Engineers deals 1 damage to any target. • Put a +1/+1 counter on target creature. It gains trample and haste until end of turn. • Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") | Marta Nael

Fallaji Dragon Engine | Artifact Creature | Dragon | Prototype {2}{R} — 1/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Flying {2}: Fallaji Dragon Engine gets +1/+0 until end of turn. | Filip Burburan

Heavyweight Demolisher | Artifact Creature | Construct | Menace At the beginning of your upkeep, tap Heavyweight Demolisher unless you pay {3}. Unearth {6}{R}{R} ({6}{R}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.) | Svetlin Velinov

Mishra's Research Desk | Artifact | | {1}, {T}, Sacrifice Mishra's Research Desk: Exile the top two cards of your library. Choose one of them. Until the end of your next turn, you may play that card. Unearth {1}{R} ({1}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.) | Matt Stewart