Aaravos, Grand Schemer

When Aaravos, Grand Schemer enters the battlefield search your library for any number
of legendary wizards with partner with...

Whenever another legendary wizard enters the battlefield under your control draw two cards,
if that wizard is black draw three cards instead.

If Aaravos, Grand Schemer would leave the battlefield it loses all abilities and becomes a legendary artifact named Prison of Aaravos with 'If this artifact would leave the battlefield Exile it and return it to the battlefield as