This spell costs less to cast, where X is the total mana value of noncreature artifacts you control.

Sacrifice two artifacts: Return Metalwork Colossus from your graveyard to your hand.

, Mill a card: Add . (To mill a card, put the top card of your library into your graveyard.)

Whenever an opponent casts a spell, you have five seconds to choose a keyword you haven't chosen for a card named Modular Monstrosity today that's been printed on a creature card. If you do, Modular Monstrosity gains that ability. Otherwise, Modular Monstrosity loses all keyword abilities.

When Multiform Wonder enters, you get (three energy counters).

Pay : Multiform Wonder gains your choice of flying, vigilance, or lifelink until end of turn.

Pay : Multiform Wonder gets +2/-2 or -2/+2 until end of turn.

Kicker

If Myriad Construct was kicked, it enters with a +1/+1 counter on it for each nonbasic land your opponents control.

When Myriad Construct becomes the target of a spell, sacrifice it and create a number of 1/1 colorless Construct artifact creature tokens equal to its power.

: Narstad Scrapper gets +1/+0 until end of turn.

Menace

When Noxious Gearhulk enters, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness.

Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Whenever you cast an artifact spell, put a +1/+1 counter on Patchwork Automaton.

Pentavus enters with five +1/+1 counters on it.

, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.

, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

When Phyrexian Devourer's power is 7 or greater, sacrifice it.

Exile the top card of your library: Put X +1/+1 counters on Phyrexian Devourer, where X is the exiled card's mana value.

Phyrexian Ironfoot doesn't untap during your untap step.

: Untap Phyrexian Ironfoot. ( can be paid with one mana from a snow source.)

Cumulative upkeep—Sacrifice a creature. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

When Pierce Strider enters, target opponent loses 3 life.

When Reservoir Walker enters, you gain 3 life and get (three energy counters).

Flying

Whenever a player casts a spell, they lose 1 life for each spell they've cast this turn.

Trample

When Runaway Carriage attacks or blocks, sacrifice it at end of combat.

When Runed Servitor dies, each player draws a card.

: Add one mana of any color. Activate only once each turn.

Flying, vigilance, trample

Whenever you attack, other creatures you control get +2/+2 and gain indestructible until end of turn.

Unearth—Pay eight . (Pay eight energy counters: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Sunburst (This enters with a +1/+1 counter on it for each color of mana spent to cast it.)

Remove two +1/+1 counters from Sawtooth Thresher: Sawtooth Thresher gets +4/+4 until end of turn.

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.

Modular 2 (This creature enters with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

, Sacrifice an artifact: Search your library for a Construct card, reveal it, put it into your hand, then shuffle.

At the beginning of combat on your turn, if you control two or more multicolored permanents, Scuttling Butler gains double strike until end of turn.

: Put a -1/-1 counter on Serrated Biskelion and a -1/-1 counter on target creature.

When Shrine Steward enters, you may search your library for an Aura or Shrine card, reveal it, put it into your hand, then shuffle.

Trample, haste

When Skitterbeam Battalion enters, if you cast it, create two tokens that are copies of it.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

2/2

Slag Fiend's power and toughness are each equal to the number of artifact cards in all graveyards.

Metalcraft — Snapsail Glider has flying as long as you control three or more artifacts.

: Untap Soliton.

: Target creature can't block Spin Engine this turn.

Vigilance

When Staunch Throneguard enters, you become the monarch.

: Put a +1/+1 counter on each artifact creature you control.

Whenever Street Sweeper attacks, destroy all Auras attached to target land.

When Su-Chi dies, add .

Flying, vigilance, haste

Sunbird Effigy's power and toughness are each equal to the number of colors among the exiled cards used to craft it.

: For each color among the exiled cards used to craft Sunbird Effigy, add one mana of that color.

Defender

: Surge Engine loses defender and gains "This creature can't be blocked."

: Surge Engine becomes blue and has base power and toughness 5/4. Activate only if Surge Engine doesn't have defender.

: Draw three cards. Activate only if Surge Engine is blue and only once.

When you control no other artifacts, sacrifice Synod Centurion.

Flying

Tetravus enters with three +1/+1 counters on it.

At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This creature can't be enchanted."

At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1/+1 counters on Tetravus.

Sacrifice an artifact: Thermal Navigator gains flying until end of turn.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Thran War Machine attacks each combat if able.

When Tocasia's Onulet leaves the battlefield, you gain 2 life.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

When Towashi Guide-Bot enters, put a +1/+1 counter on target creature you control.

, : Draw a card. This ability costs less to activate for each modified creature you control. (Equipment, Auras you control, and counters are modifications.)

When Treasure Keeper dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.

Flying

Triskelavus enters with three +1/+1 counters on it.

, Remove a +1/+1 counter from Triskelavus: Create a 1/1 colorless Triskelavite artifact creature token with flying. It has "Sacrifice this creature: This creature deals 1 damage to any target."

When Ugin's Construct enters, sacrifice a permanent that's one or more colors.

: Roll a six-sided die. Urza's Science Fair Project gets the indicated result.

1 — It gets -2/-2 until end of turn.

2 — Prevent all combat damage it would deal this turn.

3 — It gains vigilance until end of turn.

4 — It gains first strike until end of turn.

5 — It gains flying until end of turn.

6 — It gets +2/+2 until end of turn.

Trample

When Verdurous Gearhulk enters, distribute four +1/+1 counters among any number of target creatures you control.