The Brothers' War

Air Marshal | Creature | Human Soldier | {3}: Target Soldier gains flying until end of turn. | Johan Grenier

Fallaji Archaeologist | Creature | Human Scout | When Fallaji Archaeologist enters the battlefield, mill three cards. You may put a noncreature, nonland card from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on Fallaji Archaeologist. (To mill a card, put the top card of your library into your graveyard.) | Caroline Gariba

Koilos Roc | Creature | Bird | Flash Flying When Koilos Roc 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.") | Antonio José Manzanedo

Lat-Nam Adept | Creature | Human Wizard | Whenever you draw your second card each turn, put a +1/+1 counter on Lat-Nam Adept. | Zara Alfonso

Retrieval Agent | Creature | Human Soldier | {2}: Retrieval Agent gets +1/-1 until end of turn. | Vladimir Krisetskiy

Third Path Savant | Creature | Human Wizard | {7}: Draw two cards. | Artur Treffner

Wing Commando | Creature | Human Soldier | Flying Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) | David Auden Nash

Combat Courier | Artifact Creature | Construct | {2}, Sacrifice Combat Courier: Draw a card. Unearth {U} ({U}: 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.) | Alix Branwyn

Depth Charge Colossus | Artifact Creature | Dreadnought | Prototype {4}{U}{U} — 6/6 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Depth Charge Colossus doesn't untap during your untap step. {3}: Untap Depth Charge Colossus. | Daniel Ljunggren