msem-instigator

Creatures with power less than Seer of the Hunt's power can't block it.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{2}{U}: Imitate
Choose any number of target cards in graveyards. Their owners shuffle them into their libraries. Then you draw a card.
{2}{B}: Deceive
Surveil 5.
{1}{U}{B}: Obfuscate
Shadow Module gains “At the beginning of your upkeep, if there are four or more card types among cards in your graveyard, you may draw a card.”

When Shara, Prime Geneticist enters, if X isn't 0, create two X/X green Mutant creature tokens.
[+1]: Surveil 2. At the beginning of your next end step, untap up to one permanent.
[–2]: Conjure a card named Test Run into your hand. (It's a sorcery that costs {X}{G} with “Create an X/X green Mutant creature token. Draw a card.”)
[–7]: Search your library for a card and put it into your hand. Repeat this process once for each token you control. Then shuffle.

When Shardsong Seedling enters, conjure two cards named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you casting a noncreature spell causes an ability of a creature you control to trigger, that creature gains your choice of first strike, haste, menace, or trample until end of turn.

As long as it's your turn, Shell Merc has first strike and prowess.

Vigilance
Whenever one or more creatures you control deals combat damage to a player, you may discard a card. If you do, create a Function token with “Draw two cards.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Vigilance
Whenever Sibling of All Elements attacks, it gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, indestructible, lifelink, menace, and trample.

If a source you control would produce two or more mana, you may have it produce an additional {C}.
{4}: Exile the top card of your library. You may play it until the end of your next turn.

Enchant opponent
At the beginning of your end step, if you've gained 3 or more life this turn, choose one. If you've gained 7 or more life this turn choose any number instead.
• Enchanted player sacrifices a creature.
• Enchanted player discards two cards.
• Enchanted player loses 4 life.

Return target instant or sorcery card from your graveyard to your hand.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Surveil 2. When you do, destroy up to one target creature with power less than or equal to the number of card types among cards in your graveyard.

Slipstream Horizon enters tapped.
{T}: Add {U} or {R}.
{U}{R}, {T}, Sacrifice Slipstream Horizon: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

{1}, {T}: Surveil 2.
{U}, {T}, Discard a card: Look at the top card of your library. If it's a nonland card, you may cast it. (You still pay its costs)

As long as there are four or more card types among cards in your graveyard, Slipstream Silencer can't be blocked.
Whenever Slipstream Silencer attacks, surveil 1.

Whenever you discard an instant or sorcery card, you may cast it from your graveyard. (You still pay its costs.)
Spells you cast from anywhere other than your hand cost {1} less to cast.

Look at the top four cards of your library. Put one of them into your hand, another on top of your library, and the rest into your graveyard.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Lifelink
When you attain Sojourner of the Beyond, create two 1/1 white Spirit creature tokens with flying. They gain haste until end of turn.

Reach
{3}, Exile Sorrowful Seeker from your hand: Draw a card. You may cast this card for as long as it remains exiled.

{1}, {T}, Sacrifice Soul-Synthethizer: Look at the top seven cards of your library. You may reveal a card with an activated ability from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Equipped creature gets +3/+1 and has reach.
Equip {4}

Creatures your opponents control can't block alone. (They can block different creatures.)

Flying
Whenever Spirit of Vitriol attacks, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Discard a card: Spirit of Vitriol gains hexproof until end of turn. Tap it.

Whenever you gain life, put a +1/+1 counter or loyalty counter on up to that many target permanents.
Whenever you cast a white spell, create a 1/1 white Cleric creature token with lifelink.

Once during each of your turns, when you sacrifice a creature, enchantment, or planeswalker, you may choose one —
• Search your library for a card that shares a card type with the sacrificed permanent, reveal it, put it into your hand, then shuffle.
• Target opponent sacrifices a permanent that shares a card type with the sacrificed permanent.