2016 Christmas Countdown 9 : Cold Christmas Riddle

I can be made,
And unmade,
I can be one among many,
Or grouped to form something>
Some use me,
As a weapon,
In the games they play.
With a shovel,
And someone who knows,
I make a dome,
For Eskimos.
With some cole,
A scarf, a hat,
And some magic,
I form a friend.
What am I?