Umbra Mystic

Auras attached to permanents you control have umbra armor. (If an enchanted permanent you control would be destroyed, instead remove all damage from it and destroy an Aura attached to it.)

Plains

Ajani's Chosen

Whenever an enchantment you control enters, create a 2/2 white Cat creature token. If that enchantment is an Aura, you may attach it to the token.

Goldenglow Moth

Flying
Whenever this creature blocks, you may gain 4 life.

Smite

Ajani's Mantra

At the beginning of your upkeep, you may gain 1 life.

Holy Strength

Enchant creature
Enchanted creature gets +1/+2.

Soul Warden

Whenever another creature enters, you gain 1 life.

Squadron Hawk

Flying
When this creature enters, you may search your library for up to three cards named Squadron Hawk, reveal them, put them into your hand, then shuffle.

Kor Spiritdancer

This creature gets +2/+2 for each Aura attached to it.
Whenever you cast an Aura spell, you may draw a card.

Stave Off

Target creature gains protection from the color of your choice until end of turn.

Secluded Steppe

This land enters tapped.
{T}: Add {W}.
Cycling {W} ({W}, Discard this card: Draw a card.)

Lone Missionary

When this creature enters, you gain 4 life.

Angel's Feather

Whenever a player casts a white spell, you may gain 1 life.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Path to Exile

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Lifelink

Enchant creature
Enchanted creature has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)

Hyena Umbra

Enchant creature
Enchanted creature gets +1/+1 and has first strike.
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Gerrard Capashen

At the beginning of your upkeep, you gain 1 life for each card in target opponent's hand.
{3}{W}: Tap target creature. Activate only if Gerrard Capashen is attacking.