March of the Machine

Sun-Blessed Guardian | Creature | Human Cleric | {5}{R/P}: Transform Sun-Blessed Guardian. Activate only as a sorcery. ({R/P} can be paid with either {R} or 2 life.) | Brian Valeza

Bloodfeather Phoenix | Creature | Phoenix | Flying Bloodfeather Phoenix can't block. Whenever an instant or sorcery spell you control deals damage to an opponent or battle, you may pay {R}. If you do, return Bloodfeather Phoenix from your graveyard to the battlefield. It gains haste until end of turn. | Rudy Siswanto

Furnace Gremlin | Creature | Phyrexian Gremlin | {1}{R}: Furnace Gremlin gets +1/+0 until end of turn. When Furnace Gremlin dies, incubate X, where X is its power. (Create an Incubator token with X +1/+1 counters on it and "2: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.) | Tuan Duong Chu

Invasion of Mercadia // Kyren Flamewright | Battle // Creature | Siege // Goblin Spellshaper | (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 Mercadia enters, you may discard a card. If you do, draw two cards. // {2}{R}, {T}, Discard a card: Create two 1/1 blue and red Elemental creature tokens. Creatures you control get +1/+0 and gain haste until end of turn. | Cristi Balanescu

Invasion of Tarkir // Defiant Thundermaw | Battle // Creature | Siege // Dragon | (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 Tarkir enters, reveal any number of Dragon cards from your hand. When you do, Invasion of Tarkir deals X plus 2 damage to any other target, where X is the number of cards revealed this way. (X can be 0.) // Flying, trample Whenever a Dragon you control attacks, it deals 2 damage to any target. | Darren Tan

Khenra Spellspear // Gitaxian Spellstalker | Creature // Creature | Jackal Warrior // Phyrexian Jackal | Trample Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) {3}{U/P}: Transform Khenra Spellspear. Activate only as a sorcery. ({U/P} can be paid with either {U} or 2 life.) // Trample, ward {2}, prowess, prowess (Each instance of prowess triggers separately.) | Artur Nakhodkin

Pyretic Prankster | Creature | Devil | {3}{B/P}: Transform Pyretic Prankster. Activate only as a sorcery. ({B/P} can be paid with either {B} or 2 life.) | Francis Tneh

Thrashing Frontliner | Creature | Phyrexian Viashino | Trample Whenever Thrashing Frontliner attacks a battle, it gets +1/+1 until end of turn. | Pavel Kolomeyets

Trailblazing Historian | Creature | Human Shaman | Haste {T}: Another target creature gains haste until end of turn. | Jason A. Engle

Mirror-Shield Hoplite | Creature | Human Soldier | Vigilance Whenever a creature you control becomes the target of a backup ability, copy that ability. You may choose new targets for the copy. This ability triggers only once each turn. | Alex Brock