Aqua, Arch Priest

When Aqua, Arch Priest is sent to your graveyard
you may pay {u}{u} if you do, shuffle Aqua, Arch
Priest into your library.
If your devotion to blue is more than {9} you may transform Aqua, Arch Priest. (Each {u} in the
mana costs of permanents you control counts
towards your devotion to blue.)