msem-instigator

As The Mistake enters the battlefield, choose a card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
Unveil {5} ({5}: Transform this. Unveil only as a sorcery.)

Activated abilities of sources you don't control can't be activated unless they're mana abilities.

Flying, vigilance

Your opponents can't cast spells or activate abilities that aren't mana abilities this turn.

When Broken Spirit enters the battlefield, exile target creature an opponent controls until Broken Spirit leaves the battlefield.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Choose one —
• Destroy all creatures.
• Create a 4/4 white Angel creature token with flying and vigilance.

Flash
Creatures you control get +1/+1.

Reach
As Celestial Principality enters the battlefield, choose a number.
Noncreature spells with mana value equal to the chosen number can't be cast.

Distribute four -1/-1 counters among any number of target attacking or blocking creatures.

Put three -1/-1 counters on target attacking or blocking creature.

Lifelink
Sacrifice Devoted Apothecary: Remove a counter from target permanent.

When Divine Theurge enters the battlefield, choose one —
• Return target enchantment card from your graveyard to your hand.
• Return target creature card with power 2 or less from your graveyard to your hand.

Flying
{3}{W}, {T}: Exile another target creature you control, then return that card to the battlefield under your control.

Whenever a creature blocks or becomes blocked by Faceless Virtue, that creature loses all abilities until end of combat.

Flying
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever Herald of Purity is dealt damage, it deals that much damage to any target.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Lifelink
When Herald of Royalty enters the battlefield, creatures you control get +1/+1 and gain vigilance until end of turn.

When Humble Tamer enters the battlefield, create a 1/1 white Griffin creature token with flying.

Enchant creature
When Imperative Blessing enters the battlefield, draw a card.
Enchanted creature gets +2/+2.

First strike
When Imperial Dragoon enters the battlefield, target creature gets +2/+0 until end of turn.

{1}{W}, {T}: Tap target creature.
Put a -1/-1 counter on Insistent Ingenue: Untap Insistent Ingenue.

Vigilance
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

When Militia Surgeon enters the battlefield, you gain 2 life.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever Mortified Medium or another creature enters the battlefield, you gain 1 life.
As long as you have at least 10 life more than your starting life total, Mortified Medium gets +4/+4 and has flying.

Players can't get counters.
Counters can't be put on permanents.