msem-instigator

Draw two cards. Then discard a card unless you control an embattled creature. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Equipped creature gets +2/+2.
Whenever equipped creature attacks, you may return target creature card with mana value 2 or less from your graveyard to the battlefield.
Equip {2}

When Through the Dust enters, it becomes an Aura with enchant creature. Reveal the top seven cards of your library, put a creature card revealed this way onto the battlefield and attach Through the Dust to it. Then put the rest on the bottom of your library in any order. When Through the Dust is no longer on the battlefield, enchanted creature's controller sacrifices it.
Mirage {1}{U}{U}{U} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Enchant creature
Enchanted creature's activated abilities can't be activated.
Prevent all damage that would be dealt by enchanted creature.

Enchant permanent
When Tempted by Lotuses enters, enchanted permanent's owner creates three colorless artifact tokens named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
You control enchanted permanent.

{T}: Add {C}.
{3}: Mill two cards, then return Midnight Keep from your graveyard to the battlefield tapped.

Enchant creature
Enchanted creature gets +3/+2 and attacks each combat if able.

All creatures get -2/-2 until end of turn.

Exile target card from a graveyard. If you exiled a creature card this way, you gain 3 life. Otherwise, surveil 2.
Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

As an additional cost to cast this spell, pay {2} or reveal an instant or sorcery card from your hand.

Whenever Caldera Crawlers attacks, you may sacrifice a land or exile a land card from your graveyard. If you do, target creature gets +1/+1 and gains menace until end of turn.

Whenever Insatiable Student attacks, you may sacrifice an artifact. When you do, tap target creature an opponent controls.

{T}: Add {C}. Spend this mana only to cast a creature spell with a creature type no creature you control has.

Return up to two target creature cards with mana value X or less from your graveyard to the battlefield. They can't block this turn.

Shuffle any number of cards from your graveyard into your library. You gain that much life.
Draw a card.

Parasitic Bloodsucker gets +1/+1 as long as you control a Swamp.
{2}{B}: Parasitic Bloodsucker gains lifelink until end of turn

Cradle of War enters tapped.
{3}, {T}: You may put an artifact card with mana value 3 or less from your hand onto the battlefield. This ability costs {1} less to activate for each other artifact you control. Activate only as a sorcery.

{X}, {T}, Sacrifice Chemical Grenade: Up to X target creatures each get -1/-1 until end of turn.

{2}, {T}, Sacrifice Pale Morningstar Powder: Put two -1/-1 counters on target creature.

Bjarndyr Bruiser gets +2/+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.)

When this artifact enters, you gain 3 life. Surveil 2.
{T}: Add one mana of any color.

Cosmic Coalescing deals X damage to any target. You may reveal a noncreature card with mana value X or less you own from outside the game and put it into your hand. X can't be 0.
Exile Cosmic Coalescing.

Deathtouch
Discard a card: Headless Carriage gains indestructible until end of turn. Tap it.
Ride {2}{B}{B} ({2}{B}{B}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

When Splinter of Creation enters, you may exile any number of land cards from your graveyard.
You may play lands exiled with Splinter of Creation.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
When Tomb Steward enters, search your library for a card and put it into your graveyard. Then shuffle.