Defender

When Hightide Hermit enters the battlefield, you get {E}{E}{E}{E} (four energy counters).

Pay {E}{E}: Hightide Hermit can attack this turn as though it didn’t have defender.

Flying

When Eddytrail Hawk enters the battlefield, you get {E}{E} (two energy counters).

Whenever Eddytrail Hawk attacks, you may pay {E}. If you do, another target attacking creature gains flying until end of turn.

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

When Aether Poisoner enters the battlefield, you get {E}{E} (two energy counters).

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

First strike

When Aether Chaser enters the battlefield, you get {E}{E} (two energy counters).

Whenever Aether Chaser attacks, you may pay {E}{E}. If you do, create a 1/1 colorless Servo artifact creature token.

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

When Woodweaver’s Puzzleknot enters the battlefield, you gain 3 life and get {E}{E}{E} (three energy counters).

{2}{G}, Sacrifice Woodweaver’s Puzzleknot: You gain 3 life and get {E}{E}{E}.

When Thriving Rats enters the battlefield, you get {E}{E} (two energy counters).

Whenever Thriving Rats attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.

When Sage of Shaila’s Claim enters the battlefield, you get {E}{E}{E} (three energy counters).

When Reservoir Walker enters the battlefield, you gain 3 life and get {E}{E}{E} (three energy counters).

Flash (You may cast this spell any time you could cast an instant.)

Enchant creature or Vehicle

When Aether Meltdown enters the battlefield, you get {E}{E} (two energy counters).

Enchanted creature gets -4/-0.

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

Double strike (This creature deals both first-strike and regular combat damage.)

When Scrapper Champion enters the battlefield, you get {E}{E} (two energy counters).

Whenever Scrapper Champion attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.

Vigilance

When Aether Inspector enters the battlefield, you get {E}{E} (two energy counters).

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

When Shipwreck Moray enters the battlefield, you get {E}{E}{E}{E} (four energy counters).

Pay {E}: Shipwreck Moray gets +2/-2 until end of turn.

Trample

Whenever you get one or more {E} (energy counters), Territorial Gorger gets +2/+2 until end of turn.

When Thriving Rhino enters the battlefield, you get {E}{E} (two energy counters).

Whenever Thriving Rhino attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.

When Consul’s Shieldguard enters the battlefield, you get {E}{E} (two energy counters).

Whenever Consul’s Shieldguard attacks, you may pay {E}. If you do, another target attacking creature gains indestructible until end of turn.

When Aether Herder enters the battlefield, you get {E}{E} (two energy counters).

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

When Spontaneous Artist enters the battlefield, you get {E} (an energy counter).

Pay {E}: Target creature gains haste until end of turn.

When Voltaic Brawler enters the battlefield, you get {E}{E} (two energy counters).

Whenever Voltaic Brawler attacks, you may pay {E}. If you do, it gets +1/+1 and gains trample until end of turn.