Doodle, the Artistic Birb

Devoid (this card has no color)

Doodlebirb's power and toughness are equal to the
number of creatures you control.

When Doodlebirb enters the battlefield, gain control
of all other creatures on the battlefield. They cannot attack as long as you control Doodlebirb.

When Doodlebirb leaves the battlefield, return all
other creatures to their owners' hands.