msem-instigator

Changeling (This card is every creature type.)
{T}: Add {C}.

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

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

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

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 the battlefield, 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.

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.

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

({T}: Add {R} or {G}.)
Practice Range enters the battlefield tapped unless you control two or more basic lands.

As Prairie Monastery enters the battlefield, you may tap an untapped creature you control. If you don't, Prairie Monastery enters the battlefield tapped.
{T}: Add {G} or {W}.

({T}: Add {R} or {W}.)
As Prayer Hall enters the battlefield, you may pay {1}. If you don't, Prayer Hall enters the battlefield tapped.

When Pre-Crime Handler enters the battlefield, conjure a card named Data-Point into your hand. You gain 2 life. (It's a sorcery that costs {2} with “Draw a card.”)

{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.)

As Precursor Gate leaves the battlefield, you may exile it. When you do, destroy target nonland permanent.
{5}, {T}, Sacrifice Precursor Gate: Draw a card.

Precursor Sanctum enters the battlefield tapped. When it does, look at the top three cards of your library, exile one face down, then put the rest on the bottom of your library in any order.
{T}: Add {C}.
{4}, {T}: You may play the exiled card without paying its mana cost. Activate only as a sorcery.

Converge — Precursor Sentinel enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.
Remove a +1/+1 counter from Precursor Sentinel: It deals 1 damage to any target.

Pride Ridge enters the battlefield tapped.
{T}: Add {G} or {W}.
{2}{G}{W}: Until end of turn, Pride Ridge becomes a Cat creature with vigilance in addition to its other types.
Scavenge {2}{G}{W}

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {G} or {W}.

({T}: Add {B}, {R}, or {G}.)
Primal Dominion enters the battlefield tapped.

{2}: Add one mana of any color.

When Prismatic Basilisk enters the battlefield, you may search your library for a permanent card with mana value 1 or less, reveal it, put it into your hand, then shuffle.
{2/W}{2/U}{2/B}{2/R}{2/G}: Prismatic Basilisk gets +5/+5 and gains flying until end of turn.

Prismatic Cavern enters the battlefield tapped.
When Prismatic Cavern enters the battlefield, return a land you control to its owner's hand.
{T}: Add {C} and one mana of any color.

{T}, Tap an untapped creature you control: Add one mana of any color.

As Pristine Chapel enters the battlefield, you may pay 3 life. If you don't, it enters the battlefield tapped.
{T}: Add {W}, {B}, or {G}.