Yamato, Devil Blade

Equipped creature gets +3/+3, has flying, and
haste.
At the beginning of combat on your turn, if you
both own and control Yamato, Devil Blade and a planeswalker named Xiao Long, Devil Prince transform Xiao Long, Devil Prince into Xiao
Long, Devil King, then attach Yamato,
Devil Blade to it.
Equip {3}