March of the Machine

Seraph of New Capenna | Creature | Angel Soldier | Flying {4}{B/P}: Transform Seraph of New Capenna. Activate only as a sorcery. ({B/P} can be paid with either {B} or 2 life.) | Aaron J. Riley

Collective Nightmare | Instant | | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Target creature gets -3/-3 until end of turn. | Rovina Cai

Compleated Huntmaster | Creature | Phyrexian Elf Warrior | {1}, {T}, Sacrifice another creature or artifact: Incubate 3. (Create an Incubator token with three +1/+1 counters on it and "{2}: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.) | Alex Brock

Glistening Deluge | Sorcery | | All creatures get -1/-1 until end of turn. Creatures that are green and/or white get an additional -2/-2 until end of turn. | Anastasia Balakchina

Render Inert | Sorcery | | Remove up to five counters from target permanent. Draw a card. | Yigit Koroglu

Halo Forager | Creature | Faerie Rogue | Flying When Halo Forager enters the battlefield, you may pay {X}. When you do, you may cast target instant or sorcery card with mana value X from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead. | Kevin Sidharta

Invasion of Amonkhet | Battle | Siege | (As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.) When Invasion of Amonkhet enters the battlefield, each player mills three cards, then each opponent discards a card and you draw a card. (To mill three cards, a plaver buts the top three cards of their library into their graveyard.) | Jokubas Uogintas

Stormclaw Rager | Creature | Ogre Warrior | {1}, Sacrifice another creature or artifact: Put a +1/+1 counter on Stormclaw Rager and draw a card. Activate only as a sorcery. | Nicholas Elias

Elvish Vatkeeper | Creature | Phyrexian Elf | When Elvish Vatkeeper enters the battlefield, incubate 2. (Create an Incubator token with two +1/+1 counters on it and "{2}: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.) {5}: Transform target Incubator token you control. Double the number of +1/+1 counters on it. | Nicholas Gregory