Blade of the Dovakin

When Blade of the Dovakin is equipped, add a +3/+1 counter to bearer. Bearer gains First Strike, Double Strike, Last Strike.
-{w}{w}{r}: Equip to a Legendary Creature.
Costs -1 mana if Creature is a Dragonborn.
-{w}{r}{u}{p/u}: Blade of the Dovakin becomes
a 3/1 Enchantment Artifact Creature with Vigilance, Flying, Reach, Haste, Menace until your next turn.