msem-instigator

Up to one target attacking creature gets +3/+3 and gains trample until end of turn.
Harmonize. (Trigger up to one harmony of a permanent you control.)

Entropic Inferno deals 5 damage divided as you choose among any number of targets. At the beginning of the next end step, for each permanent dealt damage this way, its owner puts it on the bottom of their library, then reveals cards from the top until they reveal a nonland permanent card. They put that card onto the battlefield, then shuffle.

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

Epic Boss Fight deals 5 damage to target creature or planeswalker.
Menagerie — If there are five or more creature types among creatures you control, Epic Boss Fight deals 3 damage to that permanent's controller.

Create two tokens that are copies of target noncreature artifact or noncreature artifact card in a graveyard.

Choose X. You may choose the same mode more than once.
• Epic of the Lovers deals 1 damage to any target.
• Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
• You may discard a card. If you do, draw a card.

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.

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.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Each creature deals damage to itself equal to its power.
3 | You gain life equal to the excess damage dealt this way.
5 | Each opponent loses that much life.

Eradicating Flames deals X damage to each creature and each player. If X is 5 or more, Eradicating Flames can't be countered and the damage can't be prevented.

Reach, menace

Once each turn, when Eruq, the Flamebearer enters or you attack with one or more Horrors, you may have Eruq deal 2 damage to each opponent. Then if Eruq isn't a token, gain control of target creature an opponent controls until end of turn. Tap it. It's attacking its controller.
{2}{R}{R}, Discard Eruq: Create a token that's a copy of Eruq, the Flamebearer, except it's 4/4 and isn't legendary. Activate only as a sorcery.

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

Enchant creature
Enchanted creature attacks each combat if able.
At the beginning of your upkeep, Eternal Rage deals 2 damage to enchanted creature's controller.

Flying
Whenever Everember Phoenix deals combat damage to a player or planeswalker, you may put target exiled card you own or card in your graveyard that shares a name with it into your hand.
Revive {1}{R}{R} ({1}{R}{R}, Exile this card from your graveyard: Create a token that's a copy of this card, except it has no mana cost. Activate this ability only any time you could cast a sorcery.)

First strike
When Excavator of the Beyond enters, rediscover an artifact card. (Look at the top card of your library. You may reveal it and put it into your hand if it's an artifact card. Otherwise, put it back or into your graveyard.)

Harmony — Exciting Band deals 3 damage to any target.
When Exciting Band enters, harmonize. (Trigger up to one harmony of one permanent you control.)

Gain control of target creature until end of turn. Untap that creature. Until end of turn, it gains haste and “Whenever this creature deals combat damage to a player, aetherize it.” (To aetherize, create a token that's a copy of it, then exile that token.)

Whenever you cast a spell, put a lore counter on Exhilarating Prescience.
At the beginning of your upkeep, exile the top X cards of your library, where X is the number of lore counters on Exhilarating Prescience. You may play those cards until your next turn.

Equipped creature gets +1/+0 and has menace.
Equip {1}

Until end of turn, whenever you cast an instant or sorcery spell, you may discard a card. If you do, draw a card.

Creatures you control get +2/+0 until end of turn. Scouts you control gain trample until end of turn.

Target creature gains haste until end of turn.
Draw a card.

When Expedition Outfitter enters, create a 1/1 colorless Servo artifact creature token.
At the beginning of each end step, if an artifact was put into your graveyard from the battlefield this turn, Expedition Outfitter deals 1 damage to each opponent.

When Expensive Tutor enters, tap target land. It doesn't untap during its controller's next untap step.