msem-instigator

Return target instant or sorcery card from your graveyard to your hand.
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.)

Spirited (When this enters, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Add one mana of any color. When you do, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Enchant creature
Prevent all damage that would be dealt by enchanted creature.

Other creatures you control get +3/+0.
When Zare enters, create a 2/1 white Bird creature token with flying and a 3/3 green Horse creature token.
Whenever another creature you control attacks or blocks, sacrifice it at end of combat.

Petal Blade deals 2 damage to target attacking or blocking creature. Create a Treasure token.

Until end of turn, target creature loses all abilities and has base power and toughness 1/1. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Target player loses 3 life.

Menace, ward {2}
Whenever Envoy of Divine Progress deals combat damage to a player, you may search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

When Unbound Expanse enters, if an opponent controls more lands than you, create a Plains token. (It's a basic land with “{T}: Add {W}.”)
{3}{W}, Sacrifice Unbound Expanse: Exile each nonland permanent you control, then return those cards to the battlefield under your control. Activate only as a sorcery.

At the beginning of your first main phase, add an amount of {G} equal to Bloomhorn's power.

When Seeker of Far-Off Lands enters, search target opponent's library for a land card, put it onto the battlefield tapped under your control, then that player shuffles.

{1}, Sacrifice a creature: Create a Treasure token. Exile the top card of your library. You may play that card this turn.

When Avaz Banner enters, attach it to target creature you control.
Equipped creature gets +2/+2 and is a Soldier Army in addition to its other types.
Equip {3}

{B}, Sacrifice a creature: Put a +1/+1 counter on Lightwrencher.

For each land you control, you may return a land card from your graveyard to the battlefield tapped.

Target creature you control gets +2/+2 and gains trample until end of turn.
Ferocious — You may cast Fierce Howl as though it had flash if you control a creature with power 4 or greater.

Embellish {3}{B} (If you cast this spell for {3}{B}, create a 1/1 blue Thopter artifact creature token with flying when it enters.)
When Scrap Spiral enters, target creature gets -2/-2 until end of turn.
{3}{B}, {T}, Sacrifice an artifact: Target creature gets -2/-2 until end of turn.

{T}: Add {C}.
Harmony — Add one mana of any color.
{1}, {T}: Harmonize. (Trigger up to one harmony of one permanent you control.)

{T}: Add {R} or {W}. You lose 1 life unless you have less life than an opponent.

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
Inscribe {2}{R}{R} ({2}{R}{R}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Flying, trample
At the beginning of combat on your turn, an opponent may sacrifice a creature. If they do, you may sacrifice a creature. If you do, repeat this process. If you don't, tap Kai'Jun.

Enchant creature
Enchanted creature gets -X/-X, where X is the number of creature cards in your graveyard.

This spell costs {1} less to cast for each card you've drawn this turn.
Fiery Burst deals 3 damage divided as you choose among any number of targets.

Target player draws a card and loses 2 life, then discards three cards.

Exile target artifact or creature.