Death-Squad Reckoner

Flying, Vigilance
Rapid Fire {1}{w}{b}(When this creature is blocked or blocking, you may pay {1}{w}{b} and tap it if it is untapped. If you do, it gains Double Strike until the end of turn. It doesn't untap during your next untap step.)
Pity not those who face a Death Squad, for they were doomed as the order was given.