msem-instigator

When Trench Breaker enters, put target creature on top of its owner's library.

(Transform this if it's not attached to a creature. Pay {2}{W} as a sorcery to unattach it.)
Enchant creature you control
Trusty Steed's rider gets +2/+2.

Draw a card.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
Whenever enchanted creature becomes the target of a spell or ability, tap it.

{1}{U}{B}, Discard Karaja Hetegex: You may activate one of her loyalty abilities without paying its loyalty cost.
[–1]: Return target artifact, enchantment, or spell to its owner's hand.
[–1]: Target creature gets -2/-2 until end of turn.
[–1]: Scry 1, then draw a card.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever a player casts an instant or sorcery spell that targets only one target or activates an ability that targets only one target, copy that spell or ability for each other target it could target. Each copy targets a different one of those targets. (A spell or ability can't target itself.)

[+1]: Return target nonland permanent to its owner's hand. That player loses 2 life.
[0]: Create a 1/1 blue Bird creature token with flying for each loyalty counter on The Flock.
[–6]: You get an emblem with “If a permanent you don't control would leave the battlefield, you may instead exile it, then return that card to the battlefield under your control. It's a 1/1 blue Bird creature with flying.”

When Gendran Hostess enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Trample
Other Hounds you control get +1/+1 and have trample.

Whenever Benevolent Host attacks, if you control another Angel or Nephilim, Benevolent Host gains flying until end of turn. Surveil 1.

(Choose only one work as a sorcery to add its ability.)
When Juyu Offering Pool enters, reveal the top five cards of your library. You may put a noncreature card from among them into your hand. Put the rest on the bottom of your library in any order.
{1}{U}: Scales of Shara
Whenever you cast a noncreature spell, put a +1/+1 counter on target creature you control.
{6}{U}{U}: Eye of Shojiro
Whenever you cast a noncreature spell, create an 8/8 blue Kraken creature token.

Vanishing 2 (This permanent enters with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a player discards one or more cards, put a time counter on Fleeting Moments.
Whenever a time counter is removed from Fleeting Moments, you draw a card and you lose 1 life.

Whenever you activate a loyalty ability of Xanigan, the Darkened Cloud, you get an emblem with exalted.
[+2]: Xanigan deals 2 damage to up to one target and you gain 2 life.
[–3]: You draw three cards and you lose 3 life.
[–7]: Xanigan becomes a 7/7 Demon creature with flying and indestructible that's still a planeswalker. Prevent all combat damage that would be dealt to her.

This spell costs {1} less to cast for each artifact and/or enchantment you control.
When Avatar of Innovations enters, you may return target artifact or enchantment card from your graveyard to your hand.

Other creatures you control that are Knights or have Adventures get +1/+1.

Whenever you cast a spell with flash or an instant, untap CySec Operator.
{T}: Tap target creature.

Flying, lifelink
Whenever Blackhearted Sphinx attacks, you may pay 3 life. If you do, draw a card.

{2}{W}{B}: Exile up to two cards from a single graveyard. Recruit. Activate only as a sorcery. (Create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)
When Colpah Mystic enters, you may discard a card. If you do, creatures you control named Colpah Mystic get +2/+2 until end of turn.

Other Citizens and Peasants you control get +1/+1.
{2}{G/W}: Look at the top five cards of your library. You may reveal a Citizen or Peasant card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

{3}{R}: Attacking creatures you control get +1/+0 until end of turn.

Destroy target creature or planeswalker. Create a 1/1 black Rat creature token with “This creature can't block.”

Creatures you control get +1/+1.
When Eternal Purpose enters, exile up to two target creature cards with mana value 3 or less from your graveyard. Return them to the battlefield under your control at the beginning of the next end step.

Flying
Dragon spells and Adventure spells you cast cost {1} less to cast.