Memory Guardian

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Flying

Bounce Off

Return target creature or Vehicle to its owner's hand.

Riverchurn Monument

{1}, {T}: Any number of target players each mill two cards. (Each of them puts the top two cards of their library into their graveyard.)
Exhaust — {2}{U}{U}, {T}: Any number of target players each mill cards equal to the number of cards in their graveyard. (Activate each exhaust ability only once.)

Momentum Breaker

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
When this enchantment enters, each opponent sacrifices a creature or Vehicle of their choice. Each opponent who can't discards a card.
{2}, Sacrifice this enchantment: You gain life equal to your speed.

Wreckage Wickerfolk

Flying
When this creature enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Gas Guzzler

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
This creature enters tapped.
Max speed — {B}, Sacrifice another creature or Vehicle: Draw a card.

Diversion Unit

Flying
{U}, Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {3}.

Cursecloth Wrappings

Zombies you control get +1/+1.
{T}: Target creature card in your graveyard gains embalm until end of turn. The embalm cost is equal to its mana cost. (Exile that card and pay its embalm cost: Create a token that's a copy of it, except it's a white Zombie in addition to its other types and has no mana cost. Embalm only as a sorcery.)

Spikeshell Harrier

When this creature enters, return target creature or Vehicle an opponent controls to its owner's hand. If that opponent's speed is greater than each other player's speed, reduce that opponent's speed by 1. This effect can't reduce their speed below 1.

Gearseeker Serpent

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
{5}{U}: This creature can't be blocked this turn.

Hulldrifter

Flying
When this Vehicle enters, draw two cards.
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)

Mindspring Merfolk

Exhaust — {X}{U}{U}, {T}: Draw X cards. Put a +1/+1 counter on each Merfolk creature you control. (Activate each exhaust ability only once.)

Rangers' Refueler

Whenever you activate an exhaust ability, draw a card.
Exhaust — {4}: This Vehicle becomes an artifact creature. Put a +1/+1 counter on it. (Activate each exhaust ability only once.)
Crew 2

Skystreak Engineer

Flying
Exhaust — {4}{U}: Put two +1/+1 counters on this creature. (Activate each exhaust ability only once.)

Spectral Interference

Counter target artifact or creature spell unless its controller pays {4}.

Transit Mage

When this creature enters, you may search your library for an artifact card with mana value 4 or 5, reveal it, put it into your hand, then shuffle.

Engine Rat

Deathtouch
{5}{B}: Each opponent loses 2 life.

Grim Bauble

When this artifact enters, target creature an opponent controls gets -2/-2 until end of turn.
{2}{B}, {T}, Sacrifice this artifact: Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Aether Syphon

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
{2}, {T}: Draw a card.
Max speed — Whenever you draw a card, each opponent mills two cards. (Each opponent puts the top two cards of their library into their graveyard.)

Pactdoll Terror

Whenever this creature or another artifact you control enters, each opponent loses 1 life and you gain 1 life.

Gonti, Night Minister

Whenever a player casts a spell they don't own, that player creates a Treasure token.
Whenever a creature deals combat damage to one of your opponents, its controller looks at the top card of that opponent's library and exiles it face down. They may play that card for as long as it remains exiled. Mana of any type can be spent to cast a spell this way.

Flood the Engine

Enchant creature or Vehicle
When this Aura enters, tap enchanted permanent.
Enchanted permanent loses all abilities and doesn't untap during its controller's untap step.

Thopter Fabricator

Flying
Whenever you draw your second card each turn, create a 1/1 colorless Thopter artifact creature token with flying.
Crew 2

Possession Engine

When this Vehicle enters, gain control of target creature an opponent controls for as long as you control this Vehicle. That creature can't attack or block for as long as you control this Vehicle.
Crew 3

Stock Up

Look at the top five cards of your library. Put two of them into your hand and the rest on the bottom of your library in any order.