Nuby, Harbinger of Defeat

Flash, haste, vigilance
Dash {2}{b}{w}{r} (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.)
As Nuby, Harbinger of Defeat enters the battle-
field, choose a player. Whenever a creatures
attacks the selected player, put a +1/+1 counter it.