Texto em português

+2: Você ganha 2 pontos de vida. Coloque dois marcadores +1/+1 em até uma criatura alvo.

−3: Exile a criatura alvo. Seu controlador ganha 2 pontos de vida.

−10: As criaturas que você controla ganham voar e golpe duplo até o final do turno.

Rulings

You may activate Ajani’s first ability without choosing any target. If you do, you will gain 2 life. However, if you do choose a target and the target creature is an illegal target by the time the ability tries to resolve, the ability doesn’t resolve. You won’t gain 2 life.2019-07-12
If the target creature is an illegal target by the time Ajani’s second ability tries to resolve, the ability doesn’t resolve. No player will gain life.2019-07-12
Ajani’s last ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won’t gain flying or double strike.2019-07-12