Martial Mastermind

Martial Prowess: Whenever Martial Mastermind
attacks alone, it gains +2/+2 until end of turn.
Martial Duel ({2}{w}{w}): When Martial
Mastermind attacks, you may tap target creature
an opponent controls. If you do, Martial
Mastermind duels another target creature
defending player controls. Both creatures deal
damage to each other equal to their power.
(This ability can only be activated once per turn.)