When Agent of Treachery enters the battlefield, gain control of target permanent. At the beginning of your end step, if you control three or more permanents you don't own, draw three cards.

When Ravenous Chupacabra enters the battlefield, destroy target creature an opponent controls.

When Reclamation Sage enters the battlefield, you may destroy target artifact or enchantment.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When Shriekmaw enters the battlefield, destroy target nonartifact, nonblack creature. Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

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.

When Aether Theorist enters the battlefield, you get {E}{E}{E} (three energy counters). {T}, Pay {E}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Flying When Aethersphere Harvester enters the battlefield, you get {E}{E} (two energy counters). Pay {E}: 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 At the beginning of your upkeep, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}{E}{E}{E}{E}{E}: Return all other creatures to their owners' hands. Activate only as a sorcery.

Trample When Aetherstream Leopard enters the battlefield, you get {E} (an energy counter). Whenever Aetherstream Leopard attacks, you may pay {E}. If you do, it gets +2/+0 until end of turn.

Flying When Aethertide Whale enters the battlefield, you get {E}{E}{E}{E}{E}{E} (six energy counters). Pay {E}{E}{E}{E}: Return Aethertide Whale to its owner's hand.

Trample Whenever Aetherwind Basker enters the battlefield or attacks, you get {E} (an energy counter) for each creature you control. Pay {E}: Aetherwind Basker gets +1/+1 until end of turn.

When Bristling Hydra enters the battlefield, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: Put a +1/+1 counter on Bristling Hydra. It gains hexproof until end of turn.

Whenever a creature enters the battlefield under your control, you get {E} (an energy counter). {4}, {T}: Return target creature you control to its owner's hand.

When Electrostatic Pummeler enters the battlefield, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: Electrostatic Pummeler gets +X/+X until end of turn, where X is its power.

Flying, trample Whenever Empyreal Voyager deals combat damage to a player, you get that many {E} (energy counters).

Whenever an artifact or Artificer enters the battlefield under your control, you may pay {1}. If you do, you get {E}{E} (two energy counters). Pay {E}{E}{E}{E}{E}{E}, Sacrifice Era of Innovation: Draw three cards.

When Glassblower's Puzzleknot enters the battlefield, scry 2, then you get {E}{E}. (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 of your library and the rest on top in any order.) {2}{U}, Sacrifice Glassblower's Puzzleknot: Scry 2, then you get {E}{E}.

Menace Whenever Glint-Sleeve Siphoner enters the battlefield or attacks, you get {E} (an energy counter). At the beginning of your upkeep, you may pay {E}{E}. If you do, you draw a card and you lose 1 life.

When Greenbelt Rampager enters the battlefield, pay {E}{E} (two energy counters). If you can't, return Greenbelt Rampager to its owner's hand and you get {E}.

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.

When Janjeet Sentry enters the battlefield, you get {E}{E} (two energy counters). {T}, Pay {E}{E}: You may tap or untap target artifact or creature.

Whenever Longtusk Cub deals combat damage to a player, you get {E}{E} (two energy counters). Pay {E}{E}: Put a +1/+1 counter on Longtusk Cub.

When Minister of Inquiries enters the battlefield, you get {E}{E} (two energy counters). {T}, Pay {E}: Target player mills three cards.

When Multiform Wonder enters the battlefield, you get {E}{E}{E} (three energy counters). Pay {E}: Multiform Wonder gains your choice of flying, vigilance, or lifelink until end of turn. Pay {E}: Multiform Wonder gets +2/-2 or -2/+2 until end of turn.

If an artifact or creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

When Peema Aether-Seer enters the battlefield, you get an amount of {E} (energy counters) equal to the greatest power among creatures you control. Pay {E}{E}{E}: Target creature blocks this turn if able.

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

Trample When Riparian Tiger enters the battlefield, you get {E}{E} (two energy counters). Whenever Riparian Tiger attacks, you may pay {E}{E}. If you do, it gets +2/+2 until end of turn.

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

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

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

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

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.

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 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 Thriving Turtle enters the battlefield, you get {E}{E} (two energy counters). Whenever Thriving Turtle attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.

All creatures have haste.

When Aether Hub enters the battlefield, you get {E} (an energy counter). {T}: Add {C}. {T}, Pay {E}: Add one mana of any color.

{T}: Add one mana of any color in your commander's color identity.

({T}: Add {G}.)

({T}: Add {U}.)

{T}: Add {C}. {T}: Add {B} or {G}. Llanowar Wastes deals 1 damage to you.

({T}: Add {B}.)

Temple of Deceit enters the battlefield tapped. When Temple of Deceit enters the battlefield, scry 1. {T}: Add {U} or {B}.

Temple of Malady enters the battlefield tapped. When Temple of Malady enters the battlefield, scry 1. {T}: Add {B} or {G}.

Temple of Mystery enters the battlefield tapped. When Temple of Mystery enters the battlefield, scry 1. {T}: Add {G} or {U}.

{T}: Add {C}. {T}: Add {U} or {B}. Underground River deals 1 damage to you.

{T}, Pay 1 life: Add {G} or {U}. {1}, {T}, Sacrifice Waterlogged Grove: Draw a card.

Landfall — Whenever a land enters the battlefield under your control, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

{1}, {T}: Add {U}{B}.

When Elvish Rejuvenator enters the battlefield, look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order.

When Farhaven Elf enters the battlefield, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{1}, {T}: Add {B}{G}.

{1}, {T}: Add {G}{U}.

{T}: Add {C}{C}.

When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

{T}: You get {E} (an energy counter). {T}, Pay {E}{E}{E}: Consulate Turret deals 2 damage to target player or planeswalker.

Whenever a permanent you control is put into a graveyard, you get {E} (an energy counter). {T}, Pay {E}{E}{E}{E}{E}{E}: Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

Landfall — Whenever a land enters the battlefield under your control, you get {E} (an energy counter). Pay {E}{E}{E}{E}{E}{E}{E}{E}: Create a 6/6 colorless Beast artifact creature token.

Whenever you get one or more {E} (energy counters), put a +1/+1 counter on target creature you control. {4}, {T}: You get {E}.

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.

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.