Great Shinobi Owl

Deathblow 2, Hecproof, Haste, Firststrike.
Shinobi Charm: Opponents creatures dont regenerate toughness at the end of each turn, and opponents cannot heal.
Firecracker Slash: You may exert this creature as
it attacks, if you do, tap all creatures defending
player controls, that player takes 2x damage until
end of turn.