msem-instigator

Counter target spell and each other spell with the same name as that spell.

Destroy target artifact or enchantment and all other permanents with the same name as that permanent.

Echoing Thunder deals 3 damage to target creature and all other creatures with the same name as that creature.

When Edge of the World enters the battlefield, each player draws a card.
{T}: Each player adds {C}.

{W}{B}, {T}: Exile target nonland permanent until Ediam, the Inside Man leaves the battlefield. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.

Reach
Eerie Cocoons gets +1/+1 as long as you control another Insect.

Destroy all attacking creatures with power 3 or greater.

For each color of mana spent to cast this spell, create a 0/2 green Egg creature token.

{0}: Until end of turn, Eldritch Egg becomes a copy of target permanent card in a graveyard with mana value 6 or less except it's an artifact. Activate only once each turn. (It has no other card types.)

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

Flash
Creatures you control that have entered the battlefield this turn get +1/+1 and have haste and first strike.

Elrayin, the Manaroot enters the battlefield tapped.
Whenever you tap another land for mana, put a creation counter on Elrayin.
{T}, Remove ten creation counters from Elrayin and sacrifice it: Untap all lands target player controls.

{1}, {T}: Exile target creature you control until Elsewhere Mirror leaves the battlefield. (It returns to the battlefield under its owner's control.)
{3}: Choose a permanent card exiled with Elsewhere Mirror. Target creature becomes a copy of that card until end of turn.

If a permanent would deal damage to Elusive Fatecrafter, instead prevent that damage and exchange control of Elusive Fatecrafter and that permanent.

{1}{U}: Exile Elusive Monkey. Return it to the battlefield under its owner's control at the beginning of the next end step.

When Elven Guard becomes the target of a spell you control, you may pay {G}. If you do, transform it.

{1}: Look at the top card of your library.
{G}, {T}, Mill a card: Untap another target creature.

At the beginning of combat on your turn, look at the top card of your library. You may reveal it. If you do, target creature gets +X/+X until end of turn, where X is the revealed card's mana value.

When Ema, the Traveler enters the battlefield, reveal the top five cards of your library. Put any number of legendary cards revealed this way into your hand and the rest on the bottom of your library in any order.
{2}{B}: Another target legendary permanent gains indestructible until end of turn.

Enchant artifact or creature
When Embed enters the battlefield, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.

Until end of turn, target creature becomes black, gets +1/+0, and gains indestructible.

Haste
Whenever Emonoru, Ema's Wings attacks alone, he gains flying and double strike until end of turn.

[+1]: Emperor Tzhai deals 1 damage to each creature, planeswalker, and opponent you don't control.
[0]: Target creature can't attack you or Emperor Tzhai until Emperor Tzhai leaves the battlefield.
[–10]: You control target player.

Whenever you cast a spell, draw X cards, where X is Enai, Who Wanders Alone's power.
As long as there are no other untapped creatures on the battlefield, Enai's power and toughness are switched.

Each player can't cast more than one spell each turn.
You may cast spells from your hand without paying their mana costs.