Urza's Incubator

As Urza's Incubator enters the battlefield, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.

Ashnod's Altar

Turn to Slag

Turn to Slag deals 5 damage to target creature. Destroy all Equipment attached to that creature.

Galvanic Juggernaut

Galvanic Juggernaut attacks each combat if able.
Galvanic Juggernaut doesn't untap during your untap step.
Whenever another creature dies, untap Galvanic Juggernaut.

Darksteel Myr

Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Viridian Claw

Equipped creature gets +1/+0 and has first strike.
Equip {1}

Rejuvenation Chamber

Fading 2 (This artifact enters the battlefield with two fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
{T}: You gain 2 life.

Loxodon Warhammer

Equipped creature gets +3/+0 and has trample and lifelink.
Equip {3}

Elixir of Immortality

{2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.

Grapeshot Catapult

{T}: Grapeshot Catapult deals 1 damage to target creature with flying.

Slobad, Goblin Tinkerer

Sacrifice an artifact: Target artifact gains indestructible until end of turn.

Runesword

{3}, {T}: Target attacking creature gets +2/+0 until end of turn. When that creature leaves the battlefield this turn, sacrifice Runesword. If the creature deals damage to a creature this turn, the creature dealt damage can't be regenerated this turn. If a creature dealt damage by the targeted creature would die this turn, exile that creature instead.

Pierce Strider

When Pierce Strider enters the battlefield, target opponent loses 3 life.

Serrated Arrows

Serrated Arrows enters the battlefield with three arrowhead counters on it.
At the beginning of your upkeep, if there are no arrowhead counters on Serrated Arrows, sacrifice it.
{T}, Remove an arrowhead counter from Serrated Arrows: Put a -1/-1 counter on target creature.

Pentavus

Pentavus enters the battlefield with five +1/+1 counters on it.
{1}, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.
{1}, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

Mantis Engine

{2}: Mantis Engine gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)
{2}: Mantis Engine gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Myr Galvanizer

Other Myr creatures you control get +1/+1.
{1}, {T}: Untap each other Myr you control.

Brass Squire

{T}: Attach target Equipment you control to target creature you control.

Metrognome

When a spell or ability an opponent controls causes you to discard Metrognome, create four 1/1 colorless Gnome artifact creature tokens.
{4}, {T}: Create a 1/1 colorless Gnome artifact creature token.

Arcbound Reclaimer

Remove a +1/+1 counter from Arcbound Reclaimer: Put target artifact card from your graveyard on top of your library.
Modular 2 (This creature enters the battlefield with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Brass Man

Brass Man doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {1}. If you do, untap Brass Man.

Hedron Archive

{T}: Add {C}{C}.
{2}, {T}, Sacrifice Hedron Archive: Draw two cards.

Fodder Cannon

{4}, {T}, Sacrifice a creature: Fodder Cannon deals 4 damage to target creature.

Pristine Talisman

Astral Cornucopia

Astral Cornucopia enters the battlefield with X charge counters on it.
{T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.

Guardians of Meletis

Oxidda Golem

Affinity for Mountains (This spell costs {1} less to cast for each Mountain you control.)
Haste

Masticore

At the beginning of your upkeep, sacrifice Masticore unless you discard a card.
{2}: Masticore deals 1 damage to target creature.
{2}: Regenerate Masticore.

Squee's Toy

{T}: Prevent the next 1 damage that would be dealt to target creature this turn.

Mountain

Myr Enforcer

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

Rusted Slasher

Sacrifice an artifact: Regenerate Rusted Slasher.

Tanglebloom

Hexplate Golem

Shriekhorn

Shriekhorn enters the battlefield with three charge counters on it.
{T}, Remove a charge counter from Shriekhorn: Target player mills two cards.

Lumengrid Gargoyle

Thran Foundry

{1}, {T}, Exile Thran Foundry: Target player shuffles their graveyard into their library.

Sphere of the Suns

Sphere of the Suns enters the battlefield tapped and with three charge counters on it.
{T}, Remove a charge counter from Sphere of the Suns: Add one mana of any color.

Conversion Chamber

{2}, {T}: Exile target artifact card from a graveyard. Put a charge counter on Conversion Chamber.
{2}, {T}, Remove a charge counter from Conversion Chamber: Create a 3/3 colorless Phyrexian Golem artifact creature token.

Piston Sledge

When Piston Sledge enters the battlefield, attach it to target creature you control.
Equipped creature gets +3/+1.
Equip—Sacrifice an artifact.

Palladium Myr

Black Vise

As Black Vise enters the battlefield, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Iron Myr

Peace Strider

When Peace Strider enters the battlefield, you gain 3 life.

Razorfield Rhino

Metalcraft — Razorfield Rhino gets +2/+2 as long as you control three or more artifacts.

Myr Battlesphere

When Myr Battlesphere enters the battlefield, create four 1/1 colorless Myr artifact creature tokens.
Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Belbe's Armor

{X}, {T}: Target creature gets -X/+X until end of turn.

Monkey Cage

When a creature enters the battlefield, sacrifice Monkey Cage and create X 2/2 green Monkey creature tokens, where X is that creature's mana value.

Crystal Golem

At the beginning of your end step, Crystal Golem phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

Clock of Omens

Tap two untapped artifacts you control: Untap target artifact.

Hopping Automaton

{0}: Hopping Automaton gets -1/-1 and gains flying until end of turn.

Soul Foundry

Imprint — When Soul Foundry enters the battlefield, you may exile a creature card from your hand.
{X}, {T}: Create a token that's a copy of the exiled card. X is the mana value of that card.

Hovermyr

Clay Statue

Clockwork Hydra

Clockwork Hydra enters the battlefield with four +1/+1 counters on it.
Whenever Clockwork Hydra attacks or blocks, remove a +1/+1 counter from it. If you do, Clockwork Hydra deals 1 damage to any target.
{T}: Put a +1/+1 counter on Clockwork Hydra.

Doubling Cube

{3}, {T}: Double the amount of each type of unspent mana you have.

Bronze Horse

Trample
As long as you control another creature, prevent all damage that would be dealt to Bronze Horse by spells that target it.

Demon's Horn

Whenever a player casts a black spell, you may gain 1 life.

Dreamstone Hedron

{T}: Add {C}{C}{C}.
{3}, {T}, Sacrifice Dreamstone Hedron: Draw three cards.

Copper Carapace

Equipped creature gets +2/+2 and can't block.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Teferi's Puzzle Box

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

Golem's Heart

Whenever a player casts an artifact spell, you may gain 1 life.

Gemini Engine

Whenever Gemini Engine attacks, create a colorless Construct artifact creature token named Twin that's attacking. Its power is equal to Gemini Engine's power and its toughness is equal to Gemini Engine's toughness. Sacrifice the token at end of combat.

Wall of Shields

Defender (This creature can't attack.)
Banding (If any creatures with banding you control are blocking a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by.)