Nightwatch of the Last Dawn

Flying
Phase 3: {u}{b}, discard a card.
(When this creature becomes target of a spell or an
ability an opponent controls or if you pay its phase
costs, exile it with 3 phase counters on it. Remove a
phase counter at the beginning of each turn. When
there are no counters left, put it back onto the battlefield.)

When Nightwatch of the Last Dawn enters or
leaves the battlefield, scry 1.