msem-instigator

Whenever you cast an instant or sorcery spell, look at the bottom card of your library. You may manifest it. If you don't, put it into your hand. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Menace
At the beginning of your end step, He of All Hallow's Eve deals damage equal to its power to you unless you're horrific. (You're horrific as long as you've sacrificed a permanent or discarded a card this turn.)

Menace
When Heart of the Deadwood enters, destroy up to one target creature, then put up to one target creature card from a graveyard onto the battlefield under your control.

Until end of turn, gain control of target creature and it gains haste and shimmer. Untap it. (Whenever it attacks this turn, create a tapped and attacking token that's a copy of it. Exile that token at the beginning of the end step.)

Choose a nonland permanent type. Destroy all permanents of the chosen type. Each player who controlled a permanent destroyed this way draws a card.

Create a token that's a copy of target creature you control.
Resurface 3 (You may cast this spell from your graveyard by tapping any number of untapped creatures you control with total power 3 or greater in addition to its other costs. Exile it as it resolves.)

Colossal 5—{8}{W}{W} (You may cast this for its colossal cost to have it enter with five +1/+1 counters; or pay {8}{W}{W} as a sorcery: Put five +1/+1 counters on it if it has none.)
Ward {5}
When Hekaton Dismantler's colossal ability puts one or more counters on it, tap each creature you don't control. Those creatures don't untap during their controller's next 100 untap steps.

Flying
When Helar Ritualist enters or whenever you cast a spell, if {W}{B} was spent to cast it, each opponent loses 3 life and you gain 3 life. Put a +1/+1 counter on Helar Ritualist.

[+1]: Create a 1/1 red Cleric creature token. If you control three or more Clerics, you may instead create Aspect of Faradia, a legendary 5/5 white Angel creature token with flying and vigilance.
[–1]: Exile target creature if you control an Angel. Otherwise, that creature can't attack or block and its activated abilities can't be activated until your next turn.
[–7]: Creatures you control get +5/+5 and gain flying and vigilance until end of turn.

[+1]: Up to two target creatures you control each get +1/+1 and gain vigilance until end of turn.
[–3]: Create two 1/1 white Dwarf Peasant creature tokens. You gain 2 life.
[–7]: You get an emblem with “Creatures you control get +2/+2 and have double strike.”

Trample
Resolute — At the beginning of combat on your turn, if Helicos Gargantua's power is greater than its base power, double its power until end of turn.

Target opponent may have you draw X cards. If they don't, reveal the top X cards of your library. Hell's Verdict deals damage to that player equal to the total mana value of cards revealed this way.

Trample
Whenever Hellfire Titan enters or attacks, exile the top card of your library and up to one target instant or sorcery card with mana value 3 or less from your graveyard. Until the end of your next turn, you may play those cards.

Flying
If a source would deal damage to an opponent, it deals double that damage to that player instead.

[+1]: Each player may draw a card. For each opponent who does, you gain 4 life.
[–3]: Exile target nonland permanent. As long as that card remains exiled, its owner may pay {2} any time they could cast a sorcery. If they do, they return that card to their hand.
[–8]: Target opponent gets an emblem with “Creatures you control lose all abilities and have base power and toughness 1/1.”

[+1]: Until your next turn, if a source would deal damage to Heping, Master Arbitrator, prevent all but 1 of that damage.
[–2]: Create a white Aura enchantment token named Pacifism attached to target creature an opponent controls. It has enchant creature and “Enchanted creature can't attack or block.”
[–8]: You get an emblem with “At the beginning of your end step, your life total becomes 20.”

Pressure {2}{B} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
Menace (This creature can't be blocked except by two or more creatures.)

When Herald of Darkness enters, destroy up to one target creature with mana value 3 or less.

Whenever Herald of Earth deals combat damage to a player, draw a card.
Whenever you draw a card, put a +1/+1 counter on Herald of Earth.

Flying, haste
Whenever you attack with three or more creatures, harmonize three times. (To harmonize, trigger up to one harmony of a permanent you control.)
If you would harmonize, you may instead return Herald of Festivities from your graveyard to your hand.

Flying
Whenever Herald of Flame attacks, gain control of target permanent until end of combat. If it's a creature, you may have it become tapped and attacking.
Whenever a creature you control becomes blocked, Herald of Flame deals 3 damage to the player or planeswalker that creature is attacking.

Trample
At the beginning of your end step, if there are two or more +1/+1 counters among creatures you control, return Herald of Might from your graveyard to the battlefield.

Flying
Whenever Herald of Shadow attacks, another target creature can't be blocked this turn.
Whenever a creature you control deals combat damage to an opponent, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it.

Flying, prowess
If you would draw a card, scry 1, then draw a card instead.
Whenever an opponent casts a spell, if it's not their turn, draw a card.

Flash
When Herald of Wisdom enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.