The Brothers' War

Urza, Powerstone Prodigy | Legendary Creature | Human Artificer | Vigilance {1}, {T}: Draw a card, then discard a card. Whenever you discard one or more artifact cards, create a tapped Powerstone token. This ability triggers only once each turn. (The token is an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") | Donato Giancola

Battlefield Butcher | Creature | Human Soldier | {5}, {T}: Each opponent loses 2 life. This ability costs {1} less to activate for each creature card in your graveyard. | Lucas Graciano

Gurgling Anointer | Creature | Phyrexian Horror | Flying Whenever you draw your second card each turn, put a +1/+1 counter on Gurgling Anointer. When Gurgling Anointer dies, return another target creature card with mana value less than or equal to Gurgling Anointer's power from your graveyard to the battlefield. | David Astruga

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

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

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

Reconstructed Thopter | Artifact Creature | Thopter | Flying Unearth {2} ({2}: 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.) | Dan Scott