Astraios, Khan of the Mardu

First Strike
Dash {2}{w/b}{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.)
When Astraios attacks, creatures you control get +1/+0 and gain haste.
When Astraios leaves the battlefield, deal 2 damage to target creature.