Nidia, Mardu Battlegrace

Whenever Nidia, Mardu Battlegrace attacks,
it gets +3/+1 and has double strike.
Khansworn - If you control another legendary
creature that shares a color and creature type with
this spell, Nidia, Mardu Battlegrace gains
Bladewhirl 1 (Whenever this creature becomes
blocked, it deals 1 damage to each creature
blocking it.)
"You want to challenge me? We both know
who's going to walk away from this alive."