msem-instigator

When Abaran enters, put a -1/-1 counter on up to one target creature.
At the beginning of your upkeep, if you control a creature with the greatest toughness among creatures on the battlefield, each opponent discards a card.

Destroy target tapped creature.

Aurashaper and Aura spells you cast cost {1} less to cast.

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {R} or {G}.

Prowess
Libraries can't be searched.
Spells you cast cost {1} less to cast for each permanent you control but don't own.

When Spreading Dissent enters, exile all creatures until Spreading Dissent leaves the battlefield.
{X}: Put a random creature card with mana value X exiled with Spreading Dissent onto the battlefield. Any player may activate this ability.

Enchant creature
Enchanted creature gets +2/+2 and has vigilance.
{2}{W}: Return Tranquil Endeavors from your graveyard to your hand.

Reveal the top four cards of your library. You may put a creature card and/or a land card from among them into your hand. Put the rest into your graveyard.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Martoob Watershaper enters, tap target creature. It doesn't untap during its controller's next untap step.

Counter target planeswalker spell.
Draw a card.

Create two 1/1 blue Elemental creature tokens with flying.
Reconstruct {7}{U} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)

Flying
Wailing Soul has hexproof as long as it's not attacking or blocking.

Augmented — When you cast If Memory Serves, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, copy it twice. You may choose new targets for the copies.
Return target permanent card with mana value 3 or less from your graveyard to the battlefield. Exile If Memory Serves.

Flying
When Messenger of the Heavens enters, surveil 1.
Whenever Messenger of the Heavens deals combat damage to a player, exile any number of target creatures in its pack, then return them to the battlefield under your control. (Two or more creatures you control with equal power are in a pack.)

At the beginning of combat on your turn, for each permanent type, aetherize up to one target permanent you control of that type. (To aetherize, create a token that's a copy of it, then exile that token.)

Judge target creature you control. If you honored it, it deals damage to each other creature equal to its power. If you condemned it, return up to two creature cards with lesser mana value than the sacrificed creature from your graveyard to the battlefield. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Create a 0/0 green Wurm creature token with “This creature gets +1/+1 for each permanent card in your graveyard.”
If you would draw a card, you may instead sacrifice two lands and mill two cards. If you do, return Ruchong Awakening from your graveyard to your hand.

Put a +1/+1 counter on target creature. It gains indestructible until end of turn.

Mill four cards, then return a noncreature card from your graveyard to your hand.

Adorned — Visserine's Royal Guard has lifelink as long as it's equipped and/or enchanted.

Flying
Cards in graveyards lose all names, card types, and abilities.
Spells and abilities your opponents control can't cause you to sacrifice Manticores.

Reach
Whenever Venomtongue Archer deals damage to a creature, put that many -1/-1 counters on that creature.

Skysworn Aspirant has flying as long as it's embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Whenever Unbudging Badger attacks, if its power is 4 or greater, it gains trample until end of turn.

Deploy 4 (As this enters, you may tap any number of other creatures you control with total power 4 or more.)
When Mechanical Tactician enters deployed, tap up to two target creatures an opponent controls. Those creatures don't untap during their controller's next untap step.