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

Fallaji Chaindancer | Creature | Human Soldier | {2}: Fallaji Chaindancer gains double strike until end of turn. | Filipe Pagliuso

Mishra's Onslaught | Instant | | Choose one — • Create two 1/1 colorless Soldier artifact creature tokens. • Creatures you control get +2/+0 until end of turn. | Josu Hernaiz

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

Sibling Rivalry | Sorcery | | Gain control of target artifact or creature until end of turn. Untap it. It gains 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.") | Rovina Cai

Visions of Phyrexia | Enchantment | | At the beginning of your upkeep, exile the top card of your library. You may play that card this turn. At the beginning of your end step, if you didn't play a card from exile this 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.") | Dominik Mayer

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

Saheeli, Filigree Master | Legendary Planeswalker | Saheeli | +1: Scry 1. You may tap an untapped artifact you control. If you do, draw a card. −2: Create two 1/1 colorless Thopter artifact creature tokens with flying. They gain haste until end of turn. −4: You get an emblem with "Artifact creatures you control get +1/+1" and "Artifact spells you cast cost {1} less to cast." | Aurore Folny

Mishra, Claimed by Gix | Legendary Creature | Phyrexian Human Artificer | Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures. If Mishra, Claimed by Gix and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into Mishra, Lost to Phyrexia. It enters the battlefield tapped and attacking. | Chris Rahn