Wall of the North

Defender.
Wall of the North enters the battlefield with X
+1/+1 counters.
At the beginning of your upkeep, you may place
a +1/+1 counter on Wall of the North.
If damage would be dealt to Wall of the North,
prevent that damage and remove that many
+1/+1 counters.
Creatures your opponent's get -1/-0 for each
fortification you control.