Zeriana, Fairy of Growth

Flying, Lifelink.
Whenever you gain 1 or more life, you get a Nurture counter.
Creatures you control have "Level up - Nurture counter. Activate only at sorcery speed.
Level 1-3: Put a +1/+1 counter on this creature.
Level 4-5: Whenever this creature deals damage,
you gain 1 life.
Level 6-7: First strike or vigilance.
Level 8-9: Put a shield counter on this creature.
Level 10: Double Strike, Trample "