msem-instigator

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
At the beginning of your end step, each cursed opponent loses 1 life. You gain life equal to the life lost this way.

Menace (This creature can't be blocked except by two or more creatures.)

Other Elemental creatures you control get +1/+0.

Whenever another legendary creature you control enters, put a +1/+1 counter on The Lost and Seeking.
Surpass {4}{R}{W} ({4}{R}{W}: Transform this creature. This costs {1} less to activate for each counter on it. Activate only as a sorcery.)

Destroy target creature.
Its controller loses 2 life.

Hexproof
Whenever one or more cards are put into your graveyard from anywhere, Creeping Hidebehind gets +1/+0 until end of turn.

Flying
When Shiftscale Drake enters, look at the top card of your library. You may put that card into your graveyard.

{T}: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
At the beginning of combat on your turn, you may exile a creature card from your graveyard. When you do, target creature with the same power as the exiled card can't be blocked this turn.

Create a 1/1 blue Otter creature token with “Whenever this creature deals combat damage to a player, draw a card.”
Wanderlust — If you control four or more differently named lands, create two of those tokens instead.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
When Renegade Spiritualist becomes renowned, create a 1/1 green Spirit creature token.

Scrap, the Second Myr has all activated abilities of other artifact creatures you control.

Whenever Whisperer of Fortunes attacks, the next card you foretell this turn costs {0} to foretell.
Whenever you cast a foretold spell, put a +1/+1 counter on Whisperer of Fortunes. It gains flying until end of turn.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{R}{R}{R}: Bold
Any player may have Identity Module deal 5 damage to them. If no one does, draw three cards.
{R}{R}{R}: Brash
Identity Module deals 3 damage to any target.
{R}{R}{R}: Burning
Identity Module gains “Players can't gain life” and “At the beginning of each player's upkeep, Identity Module deals 2 damage to that player.”

Each creature card you own that isn't on the battlefield has madness. The madness cost is equal to its mana cost. (If you discard a card with madness, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
{T}, Discard a card: Dragonlord's Shrine deals 2 damage to any target.

At the beginning of your upkeep, Bauble of Infinites deals 2 damage to each opponent and you gain 2 life.

Create three 1/1 white Soldier creature tokens. Scry 3.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

When Resting Tombs enters, exile target creature an opponent controls until this enchantment leaves the battlefield.
If a creature would die, exile it instead.
{3}{B}{B}: Exile all creature cards from all graveyards. Transform Resting Tombs. Activate only as a sorcery.

When Helvault, Shard of the Moon enters, for each player, exile up to one other target nonland permanent that player controls until Helvault, Shard of the Moon leaves the battlefield. When you exile a permanent you control this way, draw three cards.
{T}: Add {C}{C}{C}{C}{C}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
When the fourth spell of a turn is cast, you may unlock Mirror Cipher. If the revealed card is an instant or sorcery card, cast it without paying its mana cost and copy it. You may choose new targets for the copy.

When Confining Priest enters, exile another target creature with power 4 or less an opponent controls until Confining Priest leaves the battlefield. (That creature returns under its owner's control.)

Whenever a creature you control deals combat damage to a player or planeswalker, you may pay {W} and/or {U}. When you pay {W} this way, put a +1/+1 counter on target creature you control. When you pay {U} this way, draw a card.

{2}{B}, {T}, Sacrifice another creature: Each opponent loses 2 life and you gain 2 life.

Haste
Ward—Pay 3 life.
Whenever Surface Expeditioneer attacks, if it's embattled, it deals 2 damage to target player or planeswalker. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

When you cast your third noncreature spell each turn, transform Aspiring Rascals.