Yamakoshi, Inflatable Diety

Flying, Indestructible
When Yamakoshi enters, turn all other creatures
face-down. They are artifacts with type Balloon. Gain control of all Balloons. You may turn a face-down
Balloon face up for its mana value. The creature gains
type Balloon in addition to its other types.
Yamakoshi's power and toughness are each equal
to the number of Balloons on the battlefield.