Cerosu Voss, Exiled

When Cerosu Voss, Exiled, enters the battlefield create Karvo, Hawk Familiar, A legendary 1/1 white bird creature token with flying and Indestructible and "When this creature attacks, put the top two cards of your library into exile".
Whenever Cerosu or Karvo attack you may pay {w}{w} to exile a creature card from your graveyard, then you may put a card from exile onto the battlefield, tapped and attacking. Remove it from the game during the next end step.