The Wall, End of the World

Flying, defender
As Pramikon, Sky Rampart enters, choose left or
right.
Each player may attack only the nearest opponent in
the chosen direction and planeswalkers controlled by
that opponent.

"Sometimes it seemed to Jon almost a living thing,
with moods of its own. The color of the ice was wont
to change with every shift of the light."
—thoughts of Jon Snow