msem-instigator

Target creature gets -1/-1 until end of turn.
Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Swiftwater Cliffs enters tapped.
When Swiftwater Cliffs enters, you gain 1 life.
{T}: Add {U} or {R}.

Flying
When Shiftscale Drake enters, look at the top card of your library. You may put that card into your graveyard.

Ward {4}
{4}{U}: Cyclesmith Oracle can't be blocked until end of turn. This ability costs {X} less to activate, where X is the number of card types among cards in your graveyard.

Whenever a creature you control is dealt damage, it gains indestructible until end of turn. (If it survives.)

Flying
Whenever you scry, create a 1/1 blue Chimera creature token with flying. This ability triggers only once each turn.

Whenever Deluge Crab perseveres, target opponent mills three cards. (A creature perseveres when it survives damage.)

{2}{G}: Exile up to three cards from graveyards. Autocrat X, where X is the number of cards exiled this way. (If you don't control an autocrat, put X +1/+1 counters on this. It becomes an autocrat until it has no +1/+1 counters on it.)
Whenever Hegemony Monarch attacks, you may exile target card from a graveyard. If you do, untap it and it gains trample until end of turn.

Enchant creature or enchantment
Enchanted permanent doesn't untap during its controller's untap step.
Enchanted permanent can't have counters put on it.

Reach
When Klothys's Lookout enters, choose one —
• You gain 3 life.
• Exile target card from a graveyard.
• Return target land card from your graveyard to your hand.

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Choose X. You may choose the same mode more than once.
• Put two +1/+1 counters on target creature you control.
• Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
• Destroy target artifact or enchantment.

Rhapsody {3}{R}{R} (Pay {3}{R}{R} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
Whenever Vindictive Guardian or another creature you control enters, if that creature's power is 4 or greater, create a Treasure token.

Flying
When Shoal Raker enters, draw a card if an opponent is cursed.

Kaur, End of Lies costs {X} less to cast, where X is the greatest mana value among permanents your opponents control.
[+2]: Reveal the top card of your library. If it's a permanent card, put it onto the battlefield.
[–4]: Exile target noncreature permanent, then reveal the top four cards of your library. You may put a permanent card from among them onto the battlefield. Put the rest into your graveyard.
[–12]: Search your library for up to X permanent cards, where X is the number of permanents you control, put them onto the battlefield, then shuffle.

When Sofia enters, if it wasn't cast from your hand, it gains lifelink and haste until end of turn.
Whenever Sofia deals combat damage to a player, exile the top card of that player's library face down and look at it. After the current turn has ended, you may cast that spell from exile by paying life equal to its mana value rather than paying its mana cost. If you do, the spell is foretold.
Foretell {B}{R/W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

{T}: Add {B}, {R}, or {G}.
Cycling {2} ({2}, Discard this card: Draw a card.)

You gain 7 life.
Coalesce {5}{G}{G} (You may cast this from your graveyard for {5}{G}{G}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

{T}: Add {C}.
{3}, {T}, Sacrifice Mystical Tomb: Return target artifact, enchantment, or legendary card from your graveyard to your hand.

Azos's Fury deals 6 damage to target creature or planeswalker you don't control. When excess damage is dealt this way, choose one —
• Add that much {R}.
• Azos's Fury deals that much damage to that permanent's controller.

Return target instant or sorcery card from your graveyard to your hand.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

Target opponent chooses a number, then you and that player may each search one of your libraries for a permanent card and reveal them. Put each permanent card with mana value less than or equal to the chosen number onto the battlefield under their owner's control, the rest into their owners' hands, then each player who searched their library this way shuffles it.

Whenever Breakneck Barque becomes blocked by a creature, Breakneck Barque deals 3 damage to that creature.
Crew 3 (Tap any number of creatures you control with total power 3 or greater: This Vehicle becomes an artifact creature until end of turn.)

Landfall — Whenever a land you control enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Whenever Calamity Scholar attacks, if you control an artifact, put a +1/+1 counter on it.