Lya Duresh, The Great Hunter

Whenever this card destroys a creature, put a Kill counter onto this card.
With 2+ Kill counters this card gets +2/+2.
With 4+ Kill counters gains Double Strike.
With 8+ Kill counters this card gains Deathtouch.
With 10+ Kill counters this card gains Indestructible.
This card can not lose Kill counters.