The Brothers' War

Autonomous Assembler | Artifact Creature | Assembly-Worker | Prototype {1}{W} — 2/2 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Vigilance {1}, {T}: Put a +1/+1 counter on target Assembly-Worker you control. | Slawomir Maniak

Platoon Dispenser | Artifact Creature | Construct | At the beginning of your end step, if you control two or more other creatures, draw a card. {3}{W}: Create a 1/1 colorless Soldier artifact creature token. Unearth {2}{W}{W} | Leon Tukker

Tocasia's Onulet | Artifact Creature | Construct | When Tocasia's Onulet leaves the battlefield, you gain 2 life. Unearth {3}{W} ({3}{W}: 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.) | Eddie Mendoza

Mishra's Juggernaut | Artifact Creature | Juggernaut | Trample Mishra's Juggernaut attacks each combat if able. Unearth {5}{R} ({5}{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.) | Steve Prescott

Perennial Behemoth | Artifact Creature | Beast | You may play lands from your graveyard. Unearth {G}{G} ({G}{G}: 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.) | Wayne Reynolds

Rootwire Amalgam | Artifact Creature | Golem | Prototype {1}{G} — 2/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) {3}{G}{G}, Sacrifice Rootwire Amalgam: Create an X/X colorless Golem artifact creature token, where X is three times Rootwire Amalgam's power. It gains haste until end of turn. Activate only as a sorcery. | Leon Tukker

Power Plant Worker | Artifact Creature | Assembly-Worker | {3}: Power Plant Worker gets +2/+2 until end of turn. If you control creatures named Mine Worker and Tower Worker, put two +1/+1 counters on Power Plant Worker instead. Activate only once each turn. | Aaron Miller

Steel Exemplar | Artifact Creature | Wizard | Trample Steel Exemplar enters the battlefield with two +1/+1 counters on it unless two or more colors of mana were spent to cast it. | Kekai Kotaki

Swiftgear Drake | Artifact Creature | Drake | Flying, haste When Swiftgear Drake enters the battlefield, put up to one target card from a graveyard on the bottom of its owner's library. | Zoltan Boros

The Mightstone and Weakstone | Legendary Artifact | Powerstone | When The Mightstone and Weakstone enters the battlefield, choose one — • Draw two cards. • Target creature gets -5/-5 until end of turn. {T}: Add {C}{C}. This mana can't be spent to cast nonartifact spells. (Melds with Urza, Lord Protector.) | Ryan Pancoast