Armored Scrapgorger gets +3/+0 as long as it has three or more oil counters on it.

: Add one mana of any color.

Whenever Armored Scrapgorger becomes tapped, exile target card from a graveyard and put an oil counter on Armored Scrapgorger.

+2: Discard up to two cards, then draw that many cards.

−2: Sacrifice an artifact. If you do, return target artifact card from your graveyard to the battlefield.

−10: You get an emblem with "Whenever an artifact is put into your graveyard from the battlefield, return that card to the battlefield at the beginning of the next end step."

Daretti, Scrap Savant can be your commander.

Living metal (As long as it's your turn, this Vehicle is also a creature.)

Human spells you control can't be countered.

Whenever Goldbug and at least one Human attack, draw a card and convert Goldbug.

When Gulping Scraptrap enters the battlefield or dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Menace

You may exert Khenra Scrapper as it attacks. When you do, it gets +2/+0 until end of turn. (An exerted creature won't untap during your next untap step.)

Sacrifice Myr Scrapling: Put a +1/+1 counter on target creature.

When Oxidda Scrapmelter enters the battlefield, destroy target artifact.

Each player exiles all artifact cards from their graveyard, then sacrifices all artifacts they control, then puts all cards they exiled this way onto the battlefield.

, Sacrifice an artifact with mana value X: Return target artifact card with mana value less than X from your graveyard to the battlefield. It gains haste until end of turn.

Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.

Scrapheap Scrounger can't block.

, Exile another creature card from your graveyard: Return Scrapheap Scrounger from your graveyard to the battlefield.

Whenever Scrappy Bruiser attacks, up to one target attacking creature gets +2/+0 and gains trample until end of turn. Return that creature to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

When Scrapwork Cohort enters the battlefield, create a 1/1 colorless Soldier artifact creature token.

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 Scrapwork Rager enters the battlefield, you draw a card and you lose 1 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.)

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.)

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

, Sacrifice another artifact: Scrapyard Steelbreaker gets +2/+1 until end of turn.

When Tomakul Scrapsmith enters the battlefield, mill three cards. You may put an artifact card from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on Tomakul Scrapsmith. (To mill a card, put the top card of your library into your graveyard.)

This spell costs less to cast for each modified creature you control. (Equipment, Auras you control, and counters are modifications.)

Trample

Walking Skyscraper has hexproof as long as it's untapped. (It can't be the target of spells or abilities your opponents control.)