Chaos Dragon Levianeer

Delve (Each card you exile from your graveyard
while casting this spell pays for {1}.)
When Chaos Dragon Levinaeer enters the battlefield, you may choose 1 —
• Destroy two target nonland permanents.
• Target opponent reveals their hand. You
choose a nonland card from it. That player place
that card at the bottom of their library.
• Return target creature from the graveyard
to the battlefield.