msem-instigator

Parasitic Bloodsucker gets +1/+1 as long as you control a Swamp.
{2}{B}: Parasitic Bloodsucker gains lifelink until end of turn

Cenotaph Possessor gets +1/+1 for each permanent you control that's an artifact, creature, and/or enchantment.
{2}{W}, {T}: Target creature gets +1/+1 for each permanent you control that's an artifact, creature, and/or enchantment. until end of turn. Activate only as a sorcery.

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.

Until end of turn, target blocked creature you control gains trample and “Whenever this creature deals combat damage to a player, draw that many cards.”

Whenever you cast your first creature spell each turn, you may pay {1}. If you do, create a 1/1 colorless Spirit creature token.

Forsaken Sunseeker gets +1/+1 and has flying as long as it's not your turn.

Indestructible
As long as your devotion to white is less than five, Heliod isn't a creature.
If an effect would create one or more kinds of tokens under your control, it creates an additional token of each kind.
{3}{W}: Put a +1/+1 counter on each other creature you control. Activate only as a sorcery.

{T}, Sacrifice Rickety Guildhall: Search your library for a Forest or Island card and put it onto the battlefield tapped, then shuffle.

Vigilance
{7}{G}: Molting Linnorm gets +5/+5 and gains trample until end of turn.

{T}: Add {C}. Spend this mana only to cast an instant or sorcery spell or activate an ability.
{2}{U}: Move a counter from target creature onto another target creature.

When Ruins Entrance enters, exile up to three target cards from graveyards.
{1}, {T}: Exile target card from a graveyard.
{5}, {T}, Sacrifice Ruins Entrance: Return target card from your graveyard to your hand.

When Chigau, the Red Market enters, draw a card, then choose a creature card name.
Once each turn, you may cast a creature spell with the chosen name from your graveyard.

Aeren Hellfire deals 4 damage to any target.
You may draw a card. If you do, discard a card.

(Choose only one work as a sorcery to add its ability.)
When Fables of the Ill-Fated enters, destroy target nonland permanent.
{B}: The Witch's Temple
Whenever a nonland permanent you control dies, each opponent loses 1 life.
{3}{G}: Enter the Nest
{3}{G}, Sacrifice two lands: Create a 0/0 green Wurm creature token with “This creature gets +1/+1 for each permanent card in your graveyard.” Activate only as a sorcery.

Revive—{B}, Discard a card. ({B}, Discard a card, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Put target artifact or enchantment with mana value less than or equal to the number of basic lands you control on the bottom of its owner's library.

{1}: Choose one. Activate only once each turn.
• Adaptive Servitor gets +1/+1 and gains first strike until end of turn.
• Adaptive Servitor gets +2/+0 and gains trample until end of turn.

Counter target spell. You may put a lore counter on a Saga you control.

Equipped creature gets +2/+1.
When equipped creature deals combat damage to an opponent, you may sacrifice Cursebreaker Hammer. If you do, destroy target artifact or enchantment that player controls.
Equip {2}

Desecrate (When this creature enters, you may sacrifice an artifact or land.)
When Siltsplitter desecrates a permanent, each opponent sacrifices an artifact.

Another target player reveals their hand. You may choose an instant or sorcery card from it and cast it without paying its mana cost.
Fuse (You may cast one or both halves of this card from your hand.)

Solar Hatching deals 4 damage to each creature.
Coalesce {6}{R}{R} (You may cast this from your graveyard for {6}{R}{R}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
When Solar Hatching enters, each player chooses up to two lands they control and sacrifices the rest.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Settling of Kaneh enters, create two 1/1 white Soldier creature tokens if you control fewer creatures than an opponent. Then you gain 4 life if you have less life than an opponent.

({T}: Add {R}, {G}, or {W}.)
Rugged Dominion enters tapped.