msem-instigator

Tap target creature. You gain life equal to its toughness.

Flying, lifelink

Double strike

Whenever Pelaski Valiant becomes tapped, target creature gets +1/+1 until end of turn.

When Pensive Muse enters the battlefield, create a white Aura enchantment token named Seal's Love attached to target creature you control. The token has enchant creature and “Enchanted creatures you control get +1/+1.”

Flying
When Percy's Messenger enters the battlefield, you gain 2 life. You may put a lore counter on a Saga you control.

When Percy's Perfect World enters the battlefield, search your library for a legendary white card, reveal it, put it into your hand, then shuffle.
If an effect would create one or more creature tokens under your control, it creates twice that many of those tokens instead.

Perish Song enters the battlefield with three time counters on it.
At the beginning of your upkeep, remove a time counter from Perish Song. Then if it has no time counters on it, sacrifice it and destroy all creatures.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. Put a +1/+1 counter on it. It gains indestructible until end of turn.

First strike
When Petal of a Heart enters the battlefield, if you cast it, reveal up to two permanent cards with mana value 1 from your hand. For each card revealed this way, conjure a duplicate of that card into your hand.

Enchant creature you control
Enchanted creature has lifelink.
When Phantasmal Possession enters the battlefield, exile target creature an opponent controls until Phantasmal Possession leaves the battlefield.

When Phantasmal Samaritan enters the battlefield, you gain 4 life.

When Phantom Threader enters the battlefield, create a white Aura enchantment token named Spectral Whispers attached to target creature. The token has enchant creature and “Enchanted creature has double strike as long as you control it. Otherwise, it can't attack or block.”

Tap target creature. Prevent all combat damage that creature would deal this turn. It doesn't untap during its controller's next untap step.

Enchant creature
When Philosophical Conundrum enters the battlefield, scry 1.
Enchanted creature can't attack or block.

Lifelink
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

Enchant creature
When Photon Barricade enters the battlefield, draw a card.
Enchanted creature gets +1/+1 and can't attack.

Defender
Phyten Bodyguards can attack as though it didn't have defender as long as you control three or more creatures.

Return X target creature cards with mana value 3 or less from your graveyard to the battlefield, then choose one of them and exile the rest.

Adjudicate, then target creature gets +1/+1 until end of turn for each Aura you control. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)

If a source would deal damage to you or a permanent you control this turn, prevent all but 1 of that damage.
Metamorph {1}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Flying
Morph {5}{W}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When you turn Pinnacle Seraph face up, destroy all other creatures.

Lifelink

When Pious Flutist enters the battlefield, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Whenever a creature attacks you or a planeswalker you control, Pitfall Pangolin gets +1/+0 until end of turn.