Protective Wall of Light

Defender, Flying
When Protective Wall of Light enters the Battlefield, put 2 Specialty counters on this.
Whenever you prevent Damage from a deferent sources, put a Specialty Counter on this.
{t}Remove a Specialty Counter, Prevent X Damage, where X= the Number of Specialty Counters on this.
Protective Wall of Light's toughness = Specialty Counters