Serrhl, Essence of Light

{w}: Serrhl, Essence of Light becomes an
Elemental Construct Knight with base power
and toughness 3/4.
{w}{w}: If Serrhl, Essence of Light is an Elemental Construct Knight, it becomes a Elemental Spirit Construct Knight with base power and
toughness 4/6.
{w}{w}{w}: If Serrhl, Essence of Light is an
Elemental Spirit Construct Knight, it becomes
an Angel Knight with flying and indestructible
with base power and toughness 5/8.