Zathimur, Hand of Chaos

+1: Each player flips a coin onto the playing area from a height of at least one foot. When the coin lands, destroy each permanent it touches.
-3: Each player chooses up to two target nonland permanents they control and exchanges them with two target nonland permanents they don't control
-7: Each player flips 3 coins. For each coin that comes up heads, that player loses half their life rounded up.