Julian, Adept Aquanaut

Whenever Julian, Adept Aquanaut becomes
blocked, you may pay {1}. If you do, he dives.
(Exile him. Return him to the battlefield under his
owner's control at the beginning of their next upkeep.
When he enters the battlefield, he gains haste and unblockable until end of turn.)

When Julian enters the battlefield, if he wasn't
cast, scry 1, then draw a card.