Invasion of Dominaria // Serra Faithkeeper (March of the Machine)

Battle Ñ Siege // Creature Ñ Angel - Invasion of Dominaria: (As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When this Siege enters, you gain 4 life and draw a card. // Serra Faithkeeper: Flying, vigilance