Dragon of the Styride

Flying
Coda — Return...to its owner's hand (When this leaves the battlefield, you may choose from the options below and pay the indicated cost. If you do, perform the game action completed with your choice.)
• {w} — ...the bottom card of target mutate pile...
• {u} — ...the bottom card of target library...
• {b} {line} ...the bottom card of target graveyard...