msem-instigator

{T}: Add {C}.
{1}: Risti Workshop becomes a creature in addition to its other types until end of turn.
When Risti Workshop deals combat damage to an opponent, you may sacrifice it. If you do, search your library for a basic land card, put it onto the battlefield, then shuffle.

First strike, haste
Other creatures you control with flash or haste have first strike.

({T}: Add {U} or {B}.)
Sodden Cavern enters tapped.

When a creature you control scavenges Wanderer of Many, create a token that's a copy of that creature. Put a +1/+1 counter on the copy.
Scavenge {3}{U} ({3}{U}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

{1}, {T}: Add one mana of any color.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Globule of Sanctuary enters or leaves the battlefield, you gain 2 life.
{2/W}, {T}, Sacrifice Globule of Sanctuary: Draw a card.

Expunge the Terrors deals X damage to target creature or planeswalker.
Madness—{1}{R}, Exile X cards from your graveyard. (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Tomb of Great Drakes enters tapped.
{T}: Add {U}.
{2/U}{2/U}: Tomb of Great Drakes becomes a 2/2 blue Elemental creature with flying until end of turn. It's still a land.

Vigilance, menace, trample, haste
Whenever you cast a spell, you may have Thunderous Avarice consume. If you do, put a +1/+1 counter on it. (To consume, sacrifice another creature or exile a creature card from your graveyard.)
Whenever an opponent casts a spell, they may have Thunderous Avarice consume. If they don't, put a +1/+1 counter on it.

Scry 3.
Catalyze. (The next spell you cast this turn costs {1} less to cast.)

When Exergetic Chains enters, exile target nonland permanent you don't control and up to one target creature you control until Exergetic Chains leaves the battlefield.

Doomsday Horde enters tapped unless it was foreshadowed.
When Doomsday Horde dies, search your library for a card, put it into your hand, then shuffle.
Foreshadow {3}{B}{B}{B} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
Your opponents can't cast spells during your turn.
{W}{U}: Demigod — Until your next turn, whenever an opponent draws a card, you may draw a card.
{4}{W}{U}: God — If it isn't an extra turn, take an extra turn after this one. Untap all permanents you control at the beginning of that turn's end step.

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

Target creature can't be blocked this turn.

When you cast this spell from anywhere other than your hand, it deals 5 damage to any target.
Trample

{T}: Add {C}.
{T}: Add one mana of any color among planeswalkers you control.
{1}, {T}: Put a loyalty counter on target planeswalker that activated a loyalty ability this turn.

As long as Jadycian Empath is on the battlefield or in your graveyard, it's a land in addition to its other types.
Sacrifice Jadycian Empath: Add one mana of any color.

Whenever Coral Hunter attacks, another target creature can't be blocked this turn.

{1}: Look at the top card of your library.
{G}, {T}, Mill a card: Untap another target creature.

Whenever Reclamation Grovesculptor enters or attacks, put a growth counter on target noncreature permanent. It becomes a colorless Forest land and loses all other card types and land types.

At the beginning of your upkeep, choose an opponent. That player creates a 3/2 colorless Horror creature token.
{2}: Target opponent gains control of Deepdrinker's Effigy.

When Wilderness Forager enters, you may reappropriate. If you do, gain 6 life. Otherwise, gain 3 life. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

Whenever one or more nontoken Merfolk you control attack, create a 2/1 red Merfolk creature token.

Counter target spell. Mill three cards.