msem-instigator

As Evil One's Mind Tricks enters choose Lafterii or Evil One.
• Lafterii — Wizards you control have “{3}{U}, {T}: Draw a card.”
• Evil One — Whenever a Zombie you control enters, target player mills two cards.

Draw three cards.

{T}: Create an X/X green Elemental creature token, where X is Evoker of the Ancient Form's power.

Exile target creature or planeswalker. Its controller conjures a card named Data-Point into their hand. (It's a sorcery that costs {2} with “Draw a card.”)

When Evolving Elemental enters, scry 3, then reveal the top card of your library. Put a number of +1/+1 counters on Evolving Elemental equal to that card's mana value.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Enchant creature
Enchanted creature gets +2/+2.
Whenever enchanted creature attacks, create a 2/2 white Knight creature token that's tapped and attacking.

Sacrifice a creature: You lose life equal to the sacrificed creature's power and draw cards equal to its toughness.

{2}, {T}: Reveal the bottom card of your library. You gain life equal to its mana value. You may put it into your graveyard.

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.)

Scry 5.

{T}: Draw a card, then discard a card.
Whenever you cast an instant or sorcery spell, untap Exchange Scholar.

Exile target creature and all other creatures with the same name as that creature. Search all graveyards, hands, and libraries for any number of cards with the same name as that creature and exile them. Then players shuffle their libraries searched this way.

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

Counter target creature spell.
Draw a card.

Spells you cast from anywhere other than your hand can't be countered.
Whenever an opponent casts a spell with the same name as a card they own in exile or in their graveyard, you may draw a card.

Desecrate (When this creature enters, you may sacrifice an artifact or land.)
When Exemplar of Disdain desecrates a permanent, target creature you don't control gets -3/-3 until end of turn.

First strike, vigilance, lifelink

Destroy target creature with power equal to its toughness.

When Exergetic Chains enters, exile target nonland permanent you don't control and up to one target creature you control until Exergetic Chains leaves the battlefield.

Each player sacrifices a creature.

Target creature gets -X/-X until end of turn, where X is its base toughness.

Discard your hand, then draw three cards. You can't cast more spells this turn.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Vigilance
{G}, {T}: Exile up to three target cards from graveyards. If two or more of those cards share a card type, create a 1/1 colorless Servo artifact creature token.

{1}, {T}, Exile a land card from your graveyard: Add two mana in any combination of colors.
{B}{G}, {T}, Discard a card: Nourish 2. (To nourish 2, either put two +1/+1 counters on this creature or create two 1/1 white Citizen creature tokens.)