Moonlight Curator has flying as long as it's embattled. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)
The glint of light on its stolen weapon spurred it upward to find the source.
Flying {1}{U}: Reveal the top card of your library. Moonwing Watcher's base power becomes equal to that card's mana value. Prophecy {U}(Once each turn, you may exile a card with prophecy as you reveal it. When you do, you may cast it for its prophecy cost as long as it's exiled.)
Flying When Morkrut Gryff dies, surveil 1, then draw a card. (To surveil 1, look at the top card of your library. You may put that card into your graveyard.) Foreshadow {5}{U}{U}(You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)
Target opponent mills five cards, then you exile up to two instant and/or sorcery cards from that player's graveyard. You may cast those cards for as long as they remain exiled, and you may spend mana as though it were mana of any type to cast them.
“Now Daril, the essence of stealth is simple. Move with intention and purpose so that they'll think you were always meant to be there.” —Amelia, Aeon's Hand Assassin
Search your library for up to two cards with different names and reveal them. Target opponent chooses one of those cards. Put the chosen card into your graveyard and the rest into your hand. Then shuffle.
When Mystic Mackerel enters, you may have target player mill two cards. {3}{U}, Sacrifice Mystic Mackerel: Return target enchantment, instant, or sorcery card from your graveyard to your hand.
[+1]: Copy the next spell you cast this turn. You may choose new targets for the copy. [–3]: Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard. [–8]: You get an emblem with “You may cast spells without paying their mana costs.”