Owl Familiar

Creature — Bird (1/1)

Flying
When Owl Familiar enters the battlefield, draw a card, then discard a card.

Palace Familiar

Creature — Bird (1/1)

Flying
When Palace Familiar dies, draw a card.

Parcel Myr

Artifact Creature — Clue Myr (2/1)

, Sacrifice Parcel Myr: Draw a card.

Passwall Adept

Creature — Human Wizard (1/3)

: Target creature can't be blocked this turn.

Patchwork Crawler

Creature — Zombie Horror (1/2)

: Exile target creature card from your graveyard and put a +1/+1 counter on Patchwork Crawler.
Patchwork Crawler has all activated abilities of all creature cards exiled with it.

Phantasmal Mount

Creature — Illusion Horse (1/1)

Flying
: Target creature you control with toughness 2 or less gets +1/+1 and gains flying until end of turn. When Phantasmal Mount leaves the battlefield this turn, sacrifice that creature. When the creature leaves the battlefield this turn, sacrifice Phantasmal Mount.

Phantasmal Sphere

Creature — Illusion (0/1)

Flying
At the beginning of your upkeep, put a +1/+1 counter on Phantasmal Sphere, then sacrifice Phantasmal Sphere unless you pay for each +1/+1 counter on it.
When Phantasmal Sphere leaves the battlefield, target opponent creates an X/X blue Orb creature token with flying, where X is the number of +1/+1 counters on Phantasmal Sphere.

Phantom Whelp

Creature — Illusion Dog (2/2)

When Phantom Whelp attacks or blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

Pilfering Hawk

Snow Creature — Bird (1/2)

Flying
, : Draw a card, then discard a card. ( can be paid with one mana from a snow source.)

Piper Wright, Publick Reporter

Legendary Creature — Human Detective (1/2)

Whenever Piper Wright deals combat damage to a player, investigate that many times. (To investigate, create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on target creature you control.

Pixie Guide

Creature — Faerie (1/3)

Flying
Grant an Advantage — If you would roll one or more dice, instead roll that many dice plus one and ignore the lowest roll.

Plated Seastrider

Creature — Beast (1/4)

Plaxmanta

Creature — Beast (2/2)

Flash
When Plaxmanta enters the battlefield, creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)
When Plaxmanta enters the battlefield, sacrifice it unless was spent to cast it.

Pollywog Symbiote

Creature — Frog (1/3)

Each creature spell you cast costs less to cast if it has mutate.
Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.

Port Inspector

Creature — Human (1/2)

Whenever Port Inspector becomes blocked, you may look at defending player's hand.

Prize Wall

Creature — Wall (0/4)

Defender
, : You get .
, : You may put a sticker on a nonland permanent you own. Activate only as a sorcery.

Protean Thaumaturge

Creature — Human Wizard (1/1)

Constellation — Whenever an enchantment enters the battlefield under your control, you may have Protean Thaumaturge become a copy of another target creature, except it has this ability.

Purple-Crystal Crab

Creature — Crab (1/1)

When Purple-Crystal Crab dies, draw a card.

Quickling

Creature — Faerie Rogue (2/2)

Flash (You may cast this spell any time you could cast an instant.)
Flying
When Quickling enters the battlefield, sacrifice it unless you return another creature you control to its owner's hand.

Rattlechains

Creature — Spirit (2/1)

Flash
Flying
When Rattlechains enters the battlefield, target Spirit gains hexproof until end of turn.
You may cast Spirit spells as though they had flash.