msem-instigator

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever a creature deals combat damage to a player, if it was encouraged by Herald of the White Orchid this turn, create a 1/1 white Soldier creature token.

When Arcanomancer enters, return up to one target instant card and up to one target sorcery card from your graveyard to your hand.

When Bazaar Braggart enters, create a tapped Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Enchant creature
When Impish Delights enters, draw a card.
Enchanted creature gets +2/+0.

Put a number of +1/+1 counters on target creature you control equal to that creature's power.
Spell mastery — If there are two or more instant or sorcery cards in your graveyard, you may have that creature fight another target creature. (Each deals damage equal to its power to the other.)

Until end of turn, target creature you control gains “{T}: This creature deals 1 damage to any target.”
Draw a card.

Enchant opponent
You control enchanted player except during their extra turns.
At the beginning of enchanted player's end step, if it isn't an extra turn, they take an extra turn after this one.

When Druid's Grimoire enters, create two 2/2 green Wolf creature tokens.
{T}: Add {G}.

Firebolt deals 2 damage to any target.
Flashback {4}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Rakkiri Initiate gets +0/+2 as long as it's embattled. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Double strike
Engage (This creature must be blocked each combat if able.)
{1}{R}: Balanced Blade gets +1/+0 until end of turn.

Exile each creature you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

Reprise {2}{W} (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)
You gain 2 life. Then distribute X +1/+1 counters among creatures you control, where X is the amount of life this spell caused you to gain.

Each player returns each instant and sorcery card from their graveyard to their hand. Exile Ebb and Flow.

Destroy all nonenchantment permanents. If thirty or more lands were destroyed this way, you win the game.

Flying
Adorned — Steamquiver Condor has ward {2} as long as it's equipped and/or enchanted.

Morningstar Blaze deals X damage divided as you choose among one or two targets.

Whenever a creature dies, put a +1/+1 counter on Grim Armory.
Whenever a creature you control enters, you may move a +1/+1 counter from Grim Armory onto it.

Chronicle (As this enters and after your draw step, add a lore counter. Stop after III.)
[Lore I-II] Scry 1.
[Lore III] Target creature you control can't be blocked until end of turn.

Destroy target attacking or blocking creature. Flurry of Bolts deals 1 damage to each other attacking or blocking creature that creature's controller controls.

Put X -1/-1 counters on up to one target creature. Exile up to one target card from a graveyard.

Destroy target land. Its controller creates a colorless Desert land token with “{T}: Add {C}.”

Create a 4/4 red Dragon creature token with flying.
Showcase {5}{U}{R} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

Menace
{3}{R}: Transform Troublesome Throng. Activate only if it's attacking.

Whenever Gallant Chevalier attacks or blocks, put a +1/+1 counter on it and each other creature you control with a +1/+1 counter on it.