msem-instigator

Flying, vigilance
When Formless Eidolon enters, create a tapped token that's a copy of target land you control.
Evoke {3} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

When Screams from the Deep enters, exile up to one target monocolored permanent.
As long as an opponent owns three or more cards in exile, you may have Screams from the Deep assign its combat damage as though it weren't blocked.
Evoke {5} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

You may cast What Remains of Samuel Quinn from your graveyard and from the battlefield. It costs {G}{G} more to cast this way.
What Remains of Samuel Quinn enters with your choice of X counters from among +1/+1, vigilance, reach, and trample.

Flying, trample
Once during each of your turns, you may cast a spell from your graveyard without paying its mana cost.
When Yhzag, Alpha and Omega is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

{1}, Sacrifice Aberrant Apostle: Choose one. This ability costs {1} less to activate as long as Aberrant Apostle entered this turn.
• Destroy target artifact.
• Destroy target enchantment.
• Exile target card from a graveyard.

Shroudmaker's Domain enters tapped.
{T}: Add {W}.

Exile target creature. At the beginning of the next end step, return that card to the battlefield under its owner's control with your choice of X counters on it from among +1/+1, flying, first strike, lifelink, or vigilance.

Once each turn, when Atal, the Shroudmaker enters or you attack with one or more Horrors, you may create two tapped 1/1 colorless Human creature tokens. If Atal isn't a token, creatures you control gain flying until end of turn.
{2}{W}{W}, Discard Atal: Create a token that's a copy of Atal, the Shroudmaker, except it's 4/4 and isn't legendary. Activate only as a sorcery.

When Beyond the Veil enters, another target nonland permanent phases out. (Treat it and anything attached to it as though they don't exist.)
Nonland permanents you don't control with mana value 3 or less can't phase in.

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
When Bridgehaven's Finest enters, create a 1/1 colorless Human creature token.
Other creatures you control get +1/+1 as long as Bridgehaven's Finest has two or more counters on it.

Choose one. You may choose both if an opponent controls three or more tapped creatures.
• Creatures target player controls lose all abilities until end of turn.
• Destroy target tapped creature.

Flash
Flying
Whenever Dread Sacricolist enters or attacks, another target creature you control gets +1/+1 and gains flying until end of turn. Untap it.
Evoke {1}{W} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Creature cards can't leave the graveyard or exile.
Players can't cast spells from graveyards or from exile.

[+1]: Create a 1/1 colorless Human creature token.
[0]: Return target permanent card with mana value 3 or less from your graveyard to your hand. If you have an insight counter, return that permanent card to the battlefield instead.
[0]: You get an insight counter.
[–1]: Target creature can't attack or block until your next turn.

At the beginning of your end step, create a tapped 1/1 colorless Human creature token.
Whenever you attack, put a loyalty counter on each planeswalker you control.

{T}: You gain 1 life.
{1}{W}, {T}: Tap or untap another target creature.

Flying, vigilance
Whenever Sepulchral Guide attacks, prevent all combat damage that would be dealt to another target creature you control this turn. If that creature has two or more counters on it, untap it.

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
At the beginning of your upkeep, exile up to one target nonland permanent you own. If Soul Reader has two or more counters on it, return that card to the battlefield under your control. Otherwise, return that card to your hand.

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
{3}{W}: Return target nonland permanent card with mana value 1 or less from your graveyard to your hand. This ability cost {1} less to activate for each counter on Stoneport Provisioner.

When Unwitting Fanatic enters, create a 3/2 colorless Horror creature token.
Sacrifice Unwitting Fanatic: Another target permanent you control gains hexproof and indestructible until end of turn.

At the beginning of combat on each opponent's turn, that player may exile a card from their graveyard and pay {2}. If the player doesn't, creatures they control can't attack you or planeswalkers you control this turn.

When Benthic Tidebreaker enters, reveal the top card of each player's library and exile one of those cards. You may play that card for as long as it remains exiled, and you may spend blue mana as though it were mana of any color to cast it.
Evoke {1}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

You may cast spells with mana value 5 or greater as though they had flash.
As long as you control a permanent with mana value 5 or greater, Cenotaph Conjurant gets +2/+0 and can't be blocked.

Flash
When Cephalovorous Flukes enters, counter target spell or ability that targets you or a permanent you control.

Deepdrinker's Domain enters tapped.
{T}: Add {U}.