If I were you, I'd build the entire deck around this excellent Mardu commanders ultimate using proliferate synergies and the like
They have started putting money into buying up Reserve List cards, and have seen the return on their investments top 10-20% compounded annually
It is amusing that the fleshlings believe we are at war
That may not seem like much at first glance but you have an infinite mana combo on your hands if you have a repeatable way to blink it like Deadeye Navigator and any mana generator that makes enough mana like Gilded Lotus or Bloom Tender
There's potential for some interesting late-game developments here, but it takes a long while and a lot of luck to build up to the point that Winter's most powerful abilities can be activated , leaving plenty of space for opponents to charge ahead in the meantime
Its role isn't as a starter or rival Pokmon, but rather as a powerhouse that can be encountered in the wild or raised from its pre-evolved forms