Hi @ifu_gaming and welcome to the forum! 
Thanks for your question!
The Polar Guardian is a special anthill skin that was available during a limited-time event through the official top-up website. Players could get fragments of this skin by purchasing in-game currency during that specific promotion.
Unfortunately, this event has already ended and the skin is currently unavailable to obtain.
If you have any other questions, feel free to ask — we’re happy to help! 