When Aether Herder enters, you get (two energy counters).

Whenever Aether Herder attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Vigilance

When Aether Inspector enters, you get (two energy counters).

Whenever Aether Inspector attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

When Aether Poisoner enters, you get (two energy counters).

Whenever Aether Poisoner attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Choose target spell. You get (two energy counters), then you may pay any amount of . Counter that spell unless its controller pays for each paid this way.

When Aether Theorist enters, you get (three energy counters).

, Pay : Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Flying

When Aethersphere Harvester enters, you get (two energy counters).

Pay : Aethersphere Harvester gains lifelink until end of turn.

Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)

Flying

Whenever Aetherstorm Roc or another creature you control enters, you get (an energy counter).

Whenever Aetherstorm Roc attacks, you may pay . If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.

Flying

When Aethertide Whale enters, you get six (energy counters).

Pay : Return Aethertide Whale to its owner's hand.

Trample

Whenever Aetherwind Basker enters or attacks, you get (an energy counter) for each creature you control.

Pay : Aetherwind Basker gets +1/+1 until end of turn.

First strike

When Amped Raptor enters, you get (two energy counters). Then if you cast it from your hand, exile cards from the top of your library until you exile a nonland card. You may cast that card by paying an amount of equal to its mana value rather than paying its mana cost.

When Assaultron Dominator enters, you get (two energy counters).

Whenever an artifact creature you control attacks, you may pay . If you do, put your choice of a +1/+1, first strike, or trample counter on that creature.

Whenever one or more artifact creatures you control deal combat damage to a player, you get (an energy counter).

Pay : Create a tapped 3/3 colorless Robot artifact creature token.

: You get (two energy counters).

, Pay : Tap target creature.

, Pay : Draw a card.

Pay : Bespoke Battlewagon becomes an artifact creature until end of turn.

Crew 4

When Bristling Hydra enters, you get (three energy counters).

Pay : Put a +1/+1 counter on Bristling Hydra. It gains hexproof until end of turn.

When Chthonian Nightmare enters, you get (three energy counters).

Pay X , Sacrifice a creature, Return Chthonian Nightmare to its owner's hand: Return target creature card with mana value X from your graveyard to the battlefield. Activate only as a sorcery.

Choose target artifact or creature. You get (four energy counters), then you may pay an amount of equal to that permanent's mana value. If you do, gain control of it.

: You get (an energy counter).

, Pay : Consulate Turret deals 2 damage to target player or planeswalker.

: Add .

, : You get (three energy counters).

, Pay : Add three mana in any combination of colors.

Deadlock Trap enters tapped.

When Deadlock Trap enters, you get (two energy counters).

, Pay : Tap target creature or planeswalker. Its activated abilities can't be activated this turn.

Whenever a creature you control enters, you get (an energy counter).

, : Return target creature you control to its owner's hand.

Choose target creature. You get (two energy counters), then you may pay any amount of . The creature gets -1/-1 until end of turn for each paid this way.

Whenever you cast an instant or sorcery spell, you get (two energy counters).

, Pay : Dynavolt Tower deals 3 damage to any target.

Counter target spell. You get an amount of (energy counters) equal to its mana value.

Flash

Flying

When Electrozoa enters, you get (two energy counters).

At the beginning of your first main phase, tap Electrozoa unless you pay .

Flying, trample

Whenever Empyreal Voyager deals combat damage to a player, you get that many (energy counters).

Prevent all damage that would be dealt to you by sources you don't control.

When a card is put into your graveyard from anywhere, sacrifice Energy Field.

As Energy Vortex enters, choose an opponent.

At the beginning of your upkeep, remove all vortex counters from Energy Vortex.

At the beginning of the chosen player's upkeep, Energy Vortex deals 3 damage to that player unless they pay for each vortex counter on Energy Vortex.

: Put X vortex counters on Energy Vortex. Activate only during your upkeep.

Whenever an artifact or Artificer you control enters, you may pay . If you do, you get (two energy counters).

Pay six , Sacrifice Era of Innovation: Draw three cards.

When Filigree Racer enters, you get (four energy counters).

Whenever Filigree Racer attacks, you may pay . When you do, target instant or sorcery card in your graveyard gains jump-start until end of turn. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.)

Crew 1

When Glassblower's Puzzleknot enters, scry 2, then you get . (You get two energy counters. To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

, Sacrifice Glassblower's Puzzleknot: Scry 2, then you get .

Menace

Whenever Glint-Sleeve Siphoner enters or attacks, you get (an energy counter).

At the beginning of your upkeep, you may pay . If you do, you draw a card and you lose 1 life.

Whenever you lose life for the first time each turn, you get . (You get an energy counter. Damage causes loss of life.)

Pay , Sacrifice Gonti's Machinations: Each opponent loses 3 life. You gain life equal to the life lost this way.

Whenever another creature you control enters, you gain 1 life and get (an energy counter).

Whenever you attack, you may pay . When you do, put two +1/+1 counters and a flying counter on target attacking creature. It becomes an Angel in addition to its other types.

: Add .

, : You get (an energy counter).

, , Pay X , Sacrifice HELIOS One: Destroy target nonland permanent with mana value X. Activate only as a sorcery.

Target creature gets +3/+3 until end of turn. You get (two energy counters).

When Inspired Inventor enters, choose one —

• You get (three energy counters).

• Put a +1/+1 counter on target creature.

• Create a 1/1 colorless Servo artifact creature token.

If you would get one or more (energy counters), you get that many plus one instead.

: Draw a card. Activate only if you've paid or lost four or more this turn.

Choose up to one target artifact or creature card in your graveyard. You get (two energy counters). Then you may pay an amount of equal to that card's mana value. If you do, return it from your graveyard to the battlefield.

Cycling (, Discard this card: Draw a card.)

Vigilance, trample, haste

Whenever Liberty Prime, Recharged attacks or blocks, sacrifice it unless you pay (two energy counters).

, , Sacrifice an artifact: You get and draw a card.

You draw two cards, lose 2 life, and get (two energy counters).

Whenever Longtusk Cub deals combat damage to a player, you get (two energy counters).

Pay : Put a +1/+1 counter on Longtusk Cub.

When Minister of Inquiries enters, you get (two energy counters).

, Pay : Target player mills three cards.

When Peema Aether-Seer enters, you get an amount of (energy counters) equal to the greatest power among creatures you control.

Pay : Target creature blocks this turn if able.

Equipped creature gets +1/+1.

Whenever equipped creature attacks, you get (two energy counters).

Pay : Choose target creature that's blocking equipped creature. Flip a coin. If you win the flip, exile the chosen creature. Otherwise, Plasma Caster deals 1 damage to it.

Equip

Whenever Razorfield Ripper or equipped creature attacks, you get (an energy counter), then it gets +X/+X until end of turn, where X is the amount of you have.

Reconfigure—Pay or . (Pay or : Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Whenever Rex, Cyber-Hound deals combat damage to a player, they mill two cards and you get (two energy counters).

Pay : Choose target creature card in a graveyard. Exile it with a brain counter on it. Activate only as a sorcery.

Rex has all activated abilities of all cards in exile with brain counters on them.

Trample

When Riparian Tiger enters, you get (two energy counters).

Whenever Riparian Tiger attacks, you may pay . If you do, it gets +2/+2 until end of turn.

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

Draw two cards. Then discard a card at random unless you pay (two energy counters).

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.)