msem-instigator

Whenever you cast a spell that doesn't share a color with Pond Tenders, you may put target card from your graveyard on the bottom of your library.

Whenever a creature you control leaves the battlefield, you may pay {1}. If you do, scry 1.
{3}{U}, Return a creature you control to its owner's hand: Draw a card.

({T}: Add {W} or {U}.)
Pool of Light enters tapped unless you control a basic Plains or a basic Island.

As Port Town enters, you may reveal a Plains or Island card from your hand. If you don't, Port Town enters tapped.
{T}: Add {W} or {U}.

{2}{U}: Target creature can't be blocked this turn.

Whenever Portal Inhibitor attacks, exile target nonland card from defending player's graveyard. Copy it. You may cast the copy. (You still pay its costs, including color. Copies of permanents enter as tokens.)

{1}, {T}: Return target creature you control and each Aura attached to it to their owners' hands. Activate only as a sorcery.

Return Portal to the Unknown to its owner's hand: Add {U}{U}{U}. The next card you cast this turn can be cast as though it had flash.

Flying
Play with the top card of your library revealed.
Spells cost {X} more to cast, where X is the mana value of the top card of your library.

{1}{U}: Target creature can't be blocked this turn.

[+1]: Create a 1/1 green Merfolk creature token.
[0]: Target artifact or creature loses all abilities and becomes a green Seal creature with base power and toughness 3/3.
[–6]: Up to five target noncreature permanents lose all abilities and become green Merfolk creatures with base power and toughness 1/1.

When Possibility Engine enters, exile the top two cards of your library.
Wanderlust — During each of your turns, if you control four or more differently named lands, you may play a card exiled with Possibility Engine.

Whenever a player cycles a card, Possibility Grinder gets +2/+2 until end of turn.

At the beginning of your upkeep, exile the top card of each of your libraries.
Put X cards exiled with Possibility Matrix on the bottom of their owner's library: You may cast a nonland card exiled with Possibility Matrix with mana value X or less without paying its mana cost.

When Possibility Scope enters, search your library for a land card, exile it, then shuffle.
{T}: Target land you control becomes a copy of a land card exiled with Possibility Scope until end of turn.

When Posthumous Informant dies, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Postmortem Contemplation enters, draw a card.
{1}{U}: Draw a card, then discard a card.

Flying
Crumble {2}{U} (This enters with three time counters if you cast it for its crumble cost. At your upkeep, remove one. When you remove the last, sacrifice it and draw a card.)
Whenever you remove a time counter from Potato Chip Swan, create a token that's a copy of it.

Flying
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

At the beginning of each upkeep, if it's an extra turn, end the turn.
If a player would search a library, that player searches the top four cards of that library instead.

Flash
Flying
When Powder Scatterer enters, exile target noncreature spell. Its controller draws a card.

Vigilance, trample
{5}{R}{G}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)

Creatures with power equal to the number of cards in your hand can't attack.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{B}{B}{B}: Ambitous
Search your library for a card, put it into your hand, then shuffle. You lose 3 life.
{B}{B}{B}: Ruthless
Destroy target creature or planeswalker.
{B}{B}{B}: Determined
Power Module gains “At the beginning of your upkeep, you draw a card and you lose 1 life.”

{T}: Add one mana of any color. Spend this mana only to cast a multicolored spell.