Hidoru, Merciless Edge

Menace, bushido 2 (Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn.)
Whenever Hidoru, Merciless Edge deals combat damage to a player, if it or another creature you control was dealt damage this turn, destroy target non-creature permanent your opponents control.
If she doesn't leave a building aflame, there was no one inside to burn.