msem-instigator

Whenever Paomar Greatheart attacks, put a trample counter on target attacking creature in its pack. (Two or more creatures you control with equal power are in a pack.)

Trample
Creatures in Paomar Primus's pack can't be blocked by more than one creature. (Two or more creatures you control with equal power are in a pack.)

Paomar Shrine enters tapped.
{T}: Add {R} or {G}.
{R/G}, {T}, Sacrifice Paomar Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Exile target creature. If you controlled that creature, create a 4/4 red Dragon creature token with flying. Otherwise, its controller creates a 1/1 white Bird creature token with flying.
Showcase {4}{U} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

Parasol Twirler has flying as long as you control an artifact.

(Choose only one work as a sorcery to add its ability.)
When Path of the Outsider enters, return target creature to its owner's hand, then each opponent sacrifices a creature.
{2}{U}: Evanescence
{0}: Target creature phases out. Activate only during your turn and only once each turn.
{2}{B}: Anguish
Whenever a creature attacks you, it gets -1/-1 until end of turn.

(Choose only one work as a sorcery to add its ability.)
When Peacetime Murals enters, draw three cards and you gain 3 life.
{2}{G}: Grow as Two
Whenever you activate an ability of a creature you control, create a token that's a copy of that creature except it isn't legendary. This ability triggers only once each turn.
{2}{U}: A Better Mankind
Whenever a creature you control enters, you may activate one of its abilities without paying its costs. This ability triggers only once each turn.

Petal Blade deals 2 damage to target attacking or blocking creature. Create a Treasure token.

You may cast instant and sorcery cards from your graveyard. Spend no more than one mana of each color to cast spells this way each turn. If a spell cast this way would be put into your graveyard, exile it instead.

Ward—Discard a card. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player discards a card.)
You have “Ward—Discard a card.”

When Pilgrim of Many Provinces enters, draw a card. Then you may discard a creature card. If you do, draw a card.

Whenever Pilgrim of Xifang's Climb blocks a creature, that creature doesn't untap during its controller's next untap step.

You gain life equal to the greatest power among creatures you control and cards in your graveyard.
Draw a card.

Enchant land
When Pilgrim's Vantage enters, you may put a +1/+1 counter on target creature.
Enchanted land has “{T}: Add two mana of different colors.”

{T}: Target player exiles a card from their graveyard.
{1}, Exile Pinnacle of Purity: Exile all graveyards. Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Flash
When Pivot-Fist Meditant enters, choose a creature you control. Whenever that creature is dealt damage this turn, it deals that much damage to any other target.

Flash
Excess damage Polarity Sage would deal to an attacking creature is dealt to that creature's controller instead.

Inspired — Whenever Pon's Apprentice becomes untapped, target creature you control has base power and toughness 5/5 until end of turn.

Pride Ridge enters 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}

When Prince Crab enters, create a Treasure token and an Idol token. (An artifact with “{T}, Sacrifice this artifact: Add one mana of any color” and an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Vigilance
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Prophetic Prismite enters, draw a card.
{2}: Add one mana of any color.

{1}: Prototype Rice Thresher gets +1/-1 or -1/+1 until end of turn.

{T}: Add one mana of any color.
{2}{G}: Provincial Herbalist gains deathtouch until end of turn.

Whenever another Fox you control enters, Pup of a Marigold Burrow deals 1 damage to each opponent.