Malirahn, True Calamity

+1: All creatures you don't control get -3/-3, then deal damage to each opponent equal to the number of lands you control
-7: Create 3 5/5 black demon creature tokens with flying and create 3 5/5 red dragon creature tokens with flying
-10: Target Opponent takes 10 damage then deal damage to each opponent equal to the number of lands you control