msem-instigator

At the beginning of combat on your turn, you may sacrifice a creature. If you do, creatures you control get +2/+1 until end of turn.

When Eaveshoppers enters, each opponent discards a card.
Inspired — Whenever Eaveshoppers becomes untapped, exile up to one target card from a graveyard. If a land card is exiled this way, put a +1/+1 counter on Eaveshoppers.

Whenever a land you control enters, upgrade target creature. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Vigilance
• Trample

Whenever you cast a spell from anywhere other than your hand, you may sacrifice a creature. If you do, copy that spell. You may choose new targets for the copy.

Enchant creature
Enchanted creature has “Whenever this creature deals combat damage to a player, create a token that's a copy of it, except it's a 1/1 Reflection” and “When this creature leaves the battlefield, sacrifice all Reflections you control.”

{T}: Add {C}.
{T}, Pay 1 life: Add {G}.
{6}{G}, {T}, Sacrifice Ecological Refuge: Create two 3/3 green Wurm creature tokens. Activate only as a sorcery.

Flying, haste
{2}{B}{R}: Return Edarna's Augurling from your graveyard to the battlefield. Return it to your hand at the beginning of the next end step. Activate only as a sorcery.

{2}{R}, Sacrifice an artifact or land: Draw a card. Edelber Mine Captain deals 1 damage to each opponent.

Scry 1, then reveal the top card of your library. If it's a land card, put it into your hand.
Draw a card.

Flying
Civilized — Whenever Edifice Overseer attacks, if you control an artifact, a creature, and an enchantment, other attacking creatures you control gain flying until end of turn.

Enchant creature
Enchanted creature gets +2/+2, can't be the target of spells or abilities you don't control unless their controller controls no untapped lands, and can't be blocked unless all creatures defending player controls that are able to block it do so.

({T}: Add {B} or {G}.)
As Eerie Bayou enters, you may pay {1}. If you don't, Eerie Bayou enters tapped.

{T}: Add one mana of any color. Put a creation counter on Effigy of Ivory Fire.
{2}: Effigy of Ivory Fire becomes a 4/4 red Dragon artifact creature with flying until end of turn. Activate only if Effigy of Ivory Fire has three or more creation counters on it.

Enchant noncreature permanent
Enchanted permanent is a colorless Forest land. (It has “{T}: Add {G}.”)

For each color of mana spent to cast this spell, create a 0/2 green Egg creature token. (Then exile this card. You may cast the creature later from exile.)

{T}: Add {W} or {B}. You lose 1 life unless you have less life than an opponent.

When Eighth-Life Companion enters, put two +1/+1 counters on target creature you control.
Recite {1}{W} (You may cast this from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave.)
Revive {2}{W}{W} ({2}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Whenever another creature you control enters, target instant or sorcery card in your graveyard with mana value less than or equal to that creature's power gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Elaborate Firecannon doesn't untap during your untap step.
{4}, {T}: Elaborate Firecannon deals 2 damage to any target.
At the beginning of your upkeep, you may discard a card. If you do, untap Elaborate Firecannon.

When Elder Prophesier enters, look at the top five cards of your library. You may reveal a Curse card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

At the beginning of each combat, you may have Elderin, Crystalline Crusader become a copy of another target creature you control with mana value 3 or less until end of turn, except its name is still Elderin, Crystalline Crusader, it's still 3/3, still legendary, and it's an artifact in addition to its other types.
{W}{U}{B}{R}{G}: Elderin gets +3/+3 until end of turn.

Primal {U} (During your turn, you may cast this spell for {U} instead of playing a land.)
Counter target spell.

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Whenever a creature enters, each opponent loses 1 life.

Electrokinetic's Bolt deals 3 damage to target creature or planeswalker.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, Electrokinetic's Bolt deals 3 damage to that permanent's controller.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, you may have Elegant Fireslinger deal 1 damage to target creature.