When Rishkar, Peema Renegade enters the battlefield, put a +1/+1 counter on each of up to two target creatures.
Each creature you control with a counter on it has ": Add ."

When Rogue Refiner enters the battlefield, draw a card and you get (two energy counters).

, Sacrifice Ruinous Gremlin: Destroy target artifact.

Target creature gets +1/+0 and gains lifelink and indestructible until end of turn. (Damage dealt by that creature also causes its controller to gain that much life, and it can't be destroyed by damage or effects that say "destroy.")

When Sage of Shaila's Claim enters the battlefield, you get (three energy counters).

[+1]: Scry 1. Saheeli Rai deals 1 damage to each opponent.
[−2]: Create a token that's a copy of target artifact or creature you control, except it's an artifact in addition to its other types. That token gains haste. Exile it at the beginning of the next end step.
[−7]: Search your library for up to three artifact cards with different names, put them onto the battlefield, then shuffle your library.

Whenever an artifact enters the battlefield under your control, Salivating Gremlins gets +2/+0 and gains trample 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 converted mana cost.

Scrapheap Scrounger can't block.
, Exile another creature card from your graveyard: Return Scrapheap Scrounger from your graveyard to the battlefield.

Double strike (This creature deals both first-strike and regular combat damage.)
When Scrapper Champion enters the battlefield, you get (two energy counters).
Whenever Scrapper Champion attacks, you may pay . If you do, put a +1/+1 counter on it.

You may have Sculpting Steel enter the battlefield as a copy of any artifact on the battlefield.

Return target tapped creature to its owner's hand. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

When Self-Assembler enters the battlefield, you may search your library for an Assembly-Worker creature card, reveal it, put it into your hand, then shuffle your library.

When Servant of the Conduit enters the battlefield, you get (two energy counters).
, Pay : Add one mana of any color.

Create two 1/1 colorless Servo artifact creature tokens.

When Servo Schematic enters the battlefield or is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.

Flash (You may cast this spell any time you could cast an instant.)
Whenever Shielded Aether Thief blocks, you get (an energy counter).
, Pay : Draw a card.

When Shipwreck Moray enters the battlefield, you get (four energy counters).
Pay : Shipwreck Moray gets +2/-2 until end of turn.

Exchange control of target artifact you control and target artifact or creature you don't control.

Enchant creature or Vehicle
As long as enchanted permanent is a Vehicle, it's a creature in addition to its other types.
Enchanted creature gets +3/+0 and has first strike.