msem-instigator

When Provincial Loyalty enters, put a vigilance counter on each of up to two target creatures you control.
At the beginning of combat on your turn, permutate. (You may remove a counter from a creature you control. If you do, put two +1/+1 counters on a different creature you control.)

When Palace Vanguard enters, choose one —
• Create a 1/1 blue Bird creature token with flying.
• Create a 2/2 white Cat creature token.

Target player sacrifices an enchantment. You gain 4 life.

Flying
When Nest Matriarch enters, put a +1/+1 counter on another target creature you control. That creature gains lifelink until end of turn.

When Mythos Scribe enters, you may return target storied card from your graveyard to your hand. (Enchantments and legendary permanents are storied.)

Put two +1/+1 counters on target creature. (Cast a copy of this spell once while this creature is on the battlefield.)

Vigilance

Whenever another Hound you control enters, put a +1/+1 counter on Greypelt Initiate.

When Greypelt Clergy enters, choose one —
• Put a +1/+1 counter on Greypelt Clergy.
• Permutate. (You may remove a counter from a creature you control. If you do, put two +1/+1 counters on a different creature you control.)

Creatures you control gain first strike and vigilance until end of turn. Permutate. (You may remove a counter from a creature you control. If you do, put two +1/+1 counters on a different creature you control.)

When Frontier Savior enters, return up to two target creature cards with mana value 3 or less from your graveyard to the battlefield.

Choose a nonland permanent type, then destroy all nonland permanents that aren't of the chosen type.

Whenever Bourasan Street Watch attacks, you may pay {W}. If you do, Bourasan Street Watch gains indestructible until end of turn.

When Beyond the Boneyard enters, exile another target nonland permanent until Beyond the Boneyard leaves the battlefield.
Your opponents can't cast spells that share a card type with the exiled card during postcombat main phases.

When Batiga Escort enters, create a 1/1 blue Bird creature token with flying.
{2}{W}, {T}: Put a +1/+1 counter on each creature you control with flying.

Whenever a storied permanent you control enters, tap target creature an opponent controls. (Enchantments and legendary permanents are storied.)

Ambitious Ostrich has flying as long as you control a storied permanent. (Enchantments and legendary permanents are storied.)

Flying, first strike

As Aparodist enters, choose a non-Human creature type.
Aparodist is the chosen type in addition to its other types.
{1}, {T}: Put a +1/+1 counter on each creature you control of the chosen type.

Abandoned Shores enters tapped if you control another nonbasic land.
{T}: Add {G} or {U}.

Abandoned Preserve enters tapped if you control another nonbasic land.
{T}: Add {B} or {G}.

Abandoned Laboratory enters tapped if you control another nonbasic land.
{T}: Add {W} or {B}.

Abandoned Hideout enters tapped if you control another nonbasic land.
{T}: Add {U} or {R}.

Abandoned Forge enters tapped if you control another nonbasic land.
{T}: Add {R} or {W}.

{T}, Discard your hand: If two or more cards were discarded this way, search your library for a card and put that card into your hand, then shuffle.