Shunryu Kokubyo Senki

Bankai (creatures with 2 or fewer colours in their
mana costs cannot have more than one Bankai
attached to them)

After your first combat phase each turn, there are
three additional combat phases in which only the enchanted creature can attack.

Enchanted creature has Vigilance, Indestructible
and gets +1/+0 for each time it has attacked this
turn.