msem-instigator

Put two +1/+1 counters on target creature you control. When you do, it deals damage equal to its power to up to one target creature with flying.

When Poisoned Shiv enters the battlefield, destroy target creature or planeswalker.
Equipped creature gets +2/+0 and has deathtouch.
Equip {2}

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

Counter target spell unless its controller pays {2}.
Wanderlust — If that spell has mana value 2 or less and you control four or more differently named lands, counter that spell.

{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 the battlefield as tokens.)

When Possibility Engine enters the battlefield, 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.

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.

When Practiced Sorcerer enters the battlefield, return target noncreature, nonland card from your graveyard to your hand.

Target creature gets +1/+1 until end of turn. When that creature dies this turn, create a 2/2 colorless Spirit creature token.
Inscribe {3}{G} ({3}{G}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

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.

{T}: Add {C}.
Whenever you tap Primal Channeler for mana, the next creature spell you cast this turn can be cast as though it had flash.

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

Flash
When Prismatic Champion enters the battlefield, create a white Aura enchantment token named Sunward attached to target creature. The token has enchant creature and “Enchanted creature has protection from creatures.”

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

When Prodigious Telemancer enters the battlefield, you may draw a card, then discard a card.
Whenever you cast an instant or sorcery spell, you may aetherize target creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)

Equipped creature gets +0/+3.
Whenever equipped creature dies, draw a card.
Equip {3}

You may play Promethean Grotto from your graveyard.
{T}: Add {C}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Protector of the Gates can't attack unless it's equipped, enchanted, or has a card inscribed onto it.

Pulverize the Intruders deals 4 damage to any target. Create a 4/4 red Giant creature token. It gains haste until end of turn if you control a legendary creature.

When Pyroclastic Maw enters the battlefield, destroy target land. If that land was nonbasic, Pyroclastic Maw gains haste until end of turn.

Prowess
Landfall — Whenever a land enters the battlefield under your control, create a 1/1 green, blue, and red Elf Scout creature token with prowess.

When Quandary Seer enters the battlefield, target player mills three cards. You shuffle up to three cards from your graveyard into your library.

Destroy target creature or planeswalker. Create a tapped colorless land token named Fading Rift with “{T}, Sacrifice this land: Add one mana of any color.”

When Radiant Rebuker enters the battlefield, exile target nonland permanent an opponent controls until Radiant Rebuker leaves the battlefield.