Head of the Forbidden One

If you control all five pieces of the
Forbidden One, this card is indestructible
This card's Power and Toughness are equal
to the number of Forbidden one cards on the battlefield under your control.
When you control all five pieces of the
Forbidden One, you may send them to
your graveyard to search your deck for
Exodia the Forbidden and add it to
your hand