msem-instigator

Whenever you attack, you may discard a card. If you do, exile the top two cards of your library. You may play one of them this turn.
Once each turn, when a card leaves your graveyard, you may add {C}{R}.

Flying
Once each turn, when an opponent draws a card while they have more cards in hand than you, you may draw a card.

{T}: Envious Nereid deals 1 damage to target creature and 1 damage to that creature's controller.

When Envoy of Growth enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever Eos Beseecher encourages a creature, look at the top card of your library. If it's a creature card with power 2 or less, you may reveal it and put it into your hand.

Haste
Whenever another creature you control enters or attacks, Epitome of Force gets +1/+0 until end of turn. If this is the third, sixth, or ninth time this ability has triggered this turn, Epitome of Force gains your choice of first strike, menace, or trample until end of turn.

Flying, haste
Whenever Epoch Warden attacks, you may aetherize another target attacking creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)

Whenever you cast an instant or sorcery spell, create a 1/1 red Alien creature token with “This creature can't block.”
{2}{R}, Sacrifice two Aliens: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

When Equinox Sprite enters, return target card from your graveyard to your hand.

Artifacts you control have “{T}: Add one mana of any color.”
{2}{R}{G}: Create a 3/2 green Crocodile creature token with trample. It gains haste until end of turn.

Whenever you cast an instant or sorcery spell, upgrade Error Exploiter. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Hexproof

Vigilance, ward {1}
{T}: Add one mana of any color. If that mana is spent on a creature spell, it enters with an additional +1/+1 counter on it.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
When Escort Recruiter becomes renowned, look at the top three cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

All damage that would be dealt to you is dealt to Escyf, Fallen Sundancer instead.
Whenever Escyf perseveres, put a +1/+1 counter on it. (A creature perseveres when it survives damage.)

When Esiara, Skycaster's Infiltrator enters, exile target spell with mana value 4 or less.
{1}{U}{U}, Discard two cards: Exile Esiara, then return it to the battlefield under your control.
{2}{U}{U}, {T}, Exile Esiara: Until end of turn, you may play cards you don't own from exile.

Flying, vigilance
Embattled creatures you control have ward {1}. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)
Whenever one or more creatures you control deal combat damage to a player, put a +1/+1 counter on one of those creatures.

Whenever Essence Carver blocks or becomes blocked by a creature with toughness 4 or greater, Essence Carver gets +2/+2 until end of turn.

Reach
Attain {4}{G} ({4}{G}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Flying
Whenever Eta, Experimental Doctor attacks, you may exile target card from a graveyard. If a creature card was exiled this way, put a +1/+1 counter on Eta and you gain 2 life.

Eternal Duneborn enters tapped.
Foresight — Whenever you draw your second card each turn, return Eternal Duneborn from your graveyard to your hand.

Flash
Flying

{1}{G}: Return another target permanent you control to its owner's hand.
{X}{G}: You may put a creature card with mana value X or less from your hand onto the battlefield. It gains trample and haste until end of turn.

Flying
{3}{W}, {T}: Exile another target creature you control, then return that card to the battlefield under your control.

Lifelink
Whenever you draw your second card each turn, put a +1/+1 counter on Ethereal Runner.

Flying
When Ethereal Savior enters, you may return target creature card with mana value 2 or less from your graveyard to the battlefield.