Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Plains

Valor in Akros

Whenever a creature you control enters, creatures you control get +1/+1 until end of turn.

Raise the Alarm

Create two 1/1 white Soldier creature tokens.

Squadron Hawk

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

Banishing Light

When Banishing Light enters, exile target nonland permanent an opponent controls until Banishing Light leaves the battlefield.

Glorious Anthem

Soul Warden

Whenever another creature enters, you gain 1 life.