Aether Revolt

Solemn Recruit | Creature | Dwarf Warrior | Double strike Revolt — At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on Solemn Recruit. | Eric Deschamps

Disallow | Instant | | Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.) | Min Yum

Whir of Invention | Instant | | Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle. | Christine Choi

Yahenni, Undying Partisan | Legendary Creature | Aetherborn Vampire | Haste Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan. Sacrifice another creature: Yahenni gains indestructible until end of turn. | Lius Lasahido

Kari Zev's Expertise | Sorcery | | Gain control of target creature or Vehicle until end of turn. Untap it. It gains haste until end of turn. You may cast a spell with mana value 2 or less from your hand without paying its mana cost. | Jason Rainville

Pia's Revolution | Enchantment | | Whenever a nontoken artifact is put into your graveyard from the battlefield, return that card to your hand unless target opponent has Pia's Revolution deal 3 damage to them. | Clint Cearley

Rishkar, Peema Renegade | Legendary Creature | Elf Druid | When Rishkar, Peema Renegade enters the battlefield, put a +1/+1 counter on each of up to two target creatures. Each creature you control with a counter on it has "{T}: Add {G}." | Todd Lockwood

Aethersphere Harvester | Artifact | Vehicle | Flying When Aethersphere Harvester enters the battlefield, you get {E}{E} (two energy counters). Pay {E}: Aethersphere Harvester gains lifelink until end of turn. Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.) | Christine Choi

Inspiring Statuary | Artifact | | Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for {1}.) | Kirsten Zirngibl

Lifecrafter's Bestiary | Artifact | | At the beginning of your upkeep, scry 1. Whenever you cast a creature spell, you may pay {G}. If you do, draw a card. | Izzy

Peacewalker Colossus | Artifact | Vehicle | {1}{W}: Another target Vehicle you control becomes an artifact creature until end of turn. Crew 4 (Tap any number of creatures you control with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.) | Vincent Proce

Scrap Trawler | Artifact Creature | Construct | Whenever Scrap Trawler or another artifact you control is put into a graveyard from the battlefield, return to your hand target artifact card in your graveyard with lesser mana value. | Daarken