Cold War

Any player who casts a spell, activates an ability, or attacks with a creature loses 10 life.
Whenever a player casts a spell, counter that spell. Sacrifice Cold War.
Whenever a player activates an ability, counter that ability. Sacrifice Cold War.
Whenever a creature attacks, destroy that creature. Sacrifice Cold War.
"A wall is a hell of a lot better than a war."
-John F. Kennedy