Snow-bird

Flash, flying
Prey Upon -When Snow-bird enters the battlefield, destroy the most recent creature that entered the battlefield under an opponent's
control this turn with mana value 3 or less.
Dash {1}{w}{w} (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.)