As The Mistake enters, 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.)
When Broken Spirit enters, 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.)
When Divine Theurge enters, 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 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.)
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, 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, 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.