Mardu Strike Leader

Deathtouch
Whenever a creature you control attacks, that creature gains double strike until end of turn.
Dash {r}{w}{b} (You may cast this spell for its
dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand
at the beginning of the next end step.)
"Attack first, Attack fast, Attack always." -Strike team motto"