msem-instigator

{U}, {T}: Sacrifice any number of nontoken creatures. Create an X/X blue Horror creature token, where X is the total power of those creatures. Then if X is 4 or greater, you may transform Performer of Brilliance.

{T}: Add {C}.
{2}, {T}, Sacrifice Shifting Frontiers: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Create a tapped colorless enchantment land token named Paradise with hexproof and “{T}: Add one mana of any color.”
Flashback—{1}{G}, Sacrifice a creature or land. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

({T}: Add {R}.)
Spire Sanctuary enters tapped with two sanctum counters on it.
{T}, Remove a sanctum counter from Spire Sanctuary: Add {B} or {G}.

When Graygulch Howler dies, you gain 1 life for each Spirit you control.

Archive 0 (As this enters, shuffle the top zero cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
As Undue's Study enters, shuffle your graveyard into the archived library.

Target creature gets -5/-5 until end of turn.
Judge up to one target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Once each turn, when you gain life, you may exile the top card of your library. You may play that card this turn.
Whenever you cast your second spell each turn, Ignition Engine deals 2 damage to target player or planeswalker.

Haste
At the beginning of your upkeep, sacrifice Ember of Ancient Infernos unless you pay {R}.

Deception {1}{B} ({1}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Nightfall Infiltrator deals combat damage to a player, that player discards a card.

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Tracker of Wild Places envisions a creature card, you may untap a permanent you control.

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.

This spell costs {1} less to cast for each other spell you've cast this turn.

Exile the top card of your library. You may cast it. (Then exile this card. You may play the land later from exile.)

At the beginning of your end step, mill two cards and you lose 2 life.
Arise {3}{B}{R} ({3}{B}{R}, Exile this from your graveyard as a sorcery: Create a black token copy of it that's also a Zombie and can't block.)

Trample
Whenever Oshu deals combat damage to a player, gain control of target land that player controls. It becomes a 4/4 Elemental creature that's still a land.
As long as you control eight or more lands, Oshu and land creatures you control get +2/+2.

Search your library for a card, put it into your graveyard, then shuffle. (Then exile this card. You may cast the creature later from exile.)

Whenever Dryad of Rippling Leaves enters or you draw a card except during your draw step, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Choose one—
• Each opponent sacrifices a creature.
• Each opponent discards two cards.

You may play an additional land this turn.
Draw a card.

When Glowspore Swarmgrounds enters, create two 1/1 blue Elemental creature tokens with flying.
Elementals you control get +1/+1.

Concentrated Blast deals 5 damage to target creature.

Enchant creature
When Yenzu Puppeteering enters, draw a card.
{1}{U}: Untap enchanted creature.

When Keepsake of Binding enters, exile target creature an opponent controls until Keepsake of Binding leaves the battlefield.
{4}, {T}: Tap target creature with power less than the exiled card's power.

Flying
Whenever Naiala's Guide deals combat damage to a player, draw a card, then discard a card.