msem-instigator

[+1]: Exile the top card of your library. When a source you control deals damage to an opponent this turn, put the exiled card into your hand.
[–2]: Exile target nonland permanent. Its controller reveals the top card of their library, then puts it onto the battlefield if it's a permanent card.
[–6]: Exile your library. You may play cards exiled this way for the rest of the game.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Target opponent sacrifices a creature or planeswalker.
3 | That player also sacrifices an artifact or enchantment.

Reach
If a creature is attacking you and you control a Centaur, you may cast Qilan Archer without paying its mana cost and as though it had flash.

Menace

Prowess
Landfall — Whenever a land you control enters, create a 1/1 green, blue, and red Elf Scout creature token with prowess.

Destroy target tapped creature, then untap all creatures you control.

Trample
Qiyan enters with twice X +1/+1 counters on them.
If damage would be dealt to Qiyan while they have a +1/+1 counter on them, prevent that damage, remove that many +1/+1 counters from Qiyan, then create a 0/0 green Hydra creature token and put twice that many +1/+1 counters on it.

Quan Li, Dusk Operative enters with your choice of a deathtouch or +1/+1 counter on her.
Once each turn, whenever a creature in Quan Li's pack dies, create a 1/1 colorless Spirit creature token. (Two or more creatures you control with equal power are in a pack.)

When Quandary Seer enters, target player mills three cards. You shuffle up to three cards from your graveyard into your library.

Whenever Queen Hannaru enters or attacks, put a +1/+1 counter on another target creature you control.
At the beginning of your upkeep, if there are four or more +1/+1 counters among creatures you control, you may transform Queen Hannaru.

Enchant creature
When Queenscoming Feast enters, draw a card.
Whenever enchanted creature attacks, create a 1/1 white Peasant creature token.

Whenever Quick-Witted Slayer deals combat damage to a player, you draw a card and you lose 1 life.

Counter target spell. If a noncreature spell is countered this way, scry 2.

{T}: Quill Sniper deals 1 damage to any target if it's an opponent or if you control a storied permanent. (Enchantments and legendary permanents are storied.)

Attacking creatures you control have first strike.
Whenever Qulai, Orchard Guardian attacks or becomes the target of a spell or ability an opponent controls, conjure a card named Fox of the Orange Orchard into your hand. (It's a {1}{W} 3/1 Fox Spirit creature.)

When Qulai enters, look at the top six cards of your library. You may reveal a Fox card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
Sacrifice Qulai: Foxes you control gain hexproof and indestructible until end of turn.

Whenever an enchantment you control enters, create a 1/1 colorless Construct Actor creature token.
Token creatures you control have vigilance.

Lifelink
Rafiq the Magnanimous has double strike as long as it's attacking.
Whenever Rafiq the Magnanimous attacks, if it's enchanted, equipped, or was the target of a spell or ability you controlled this turn, draw a card.

Players can't gain life.
Whenever a player casts a spell, Rage of the Ravaged deals 1 damage to that player.

Trample
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Whenever Rage-Fueled Adventurer attacks, you may have it fight target creature you don't control.

Flying, haste
{3}{R}{R}: Return Rageborn Phoenix from your graveyard to your hand. If you do, it deals 1 damage to any target.

When Raging Restitched enters, you may sacrifice a creature. When you do, Raging Restitched deals damage to target creature or planeswalker equal to the sacrificed creature's power.

When this creature enters, create a Treasure token.

Flash
When Rahit's Prodigy enters, return target instant or sorcery card from your graveyard to your hand, then discard a card.

Archive 5 (As this enters, shuffle the top five cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
At the beginning of your upkeep, put the top card of any of your libraries on the bottom of the archived library, then you may put any card in the archived library on top of the archived library.