Rootborn Defenses

Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)

Oblivion Ring

When Oblivion Ring enters, exile another target nonland permanent.
When Oblivion Ring leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Geist-Honored Monk

Vigilance
Geist-Honored Monk's power and toughness are each equal to the number of creatures you control.
When Geist-Honored Monk enters, create two 1/1 white Spirit creature tokens with flying.

Honor of the Pure

Doomed Traveler

When Doomed Traveler dies, create a 1/1 white Spirit creature token with flying.

Crusader of Odric

Crusader of Odric's power and toughness are each equal to the number of creatures you control.

Spectral Procession

Create three 1/1 white Spirit creature tokens with flying.

Plains

Midnight Haunting

Create two 1/1 white Spirit creature tokens with flying.

Intangible Virtue

Creature tokens you control get +1/+1 and have vigilance.

Gather the Townsfolk

Create two 1/1 white Human creature tokens.
Fateful hour — If you have 5 or less life, create five of those tokens instead.

Increasing Devotion

Create five 1/1 white Human creature tokens. If this spell was cast from a graveyard, create ten of those tokens instead.
Flashback {7}{W}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)