How do I claim the Snow Battle rating reward? What else can I win?

To collect the rewards, simply open the rankings window when the ranking day is over. You’ll instantly see a window with your prize.

What else can I win?

Ice Medals are a unique reward that are given out to players who do the most damage in a fight, or to those who climb high enough in the rankings.
Snow Hats are unique trophy for landing the last hit on an opponent during a fight.
Union medals are a special reward for those who place highly in the Best Unions ratings.
Combo medals are a special trophy you can get for scoring combos during a fight.
Combo strike medals are an unusual trophy you can get for landing the last hit on an opponent while scoring a combo.

All these prizes can be exchanged for special buildings from the Exclusive tab of the game store.