Spectral Sailor

Flash (You may cast this spell any time you could cast an instant.)
Flying
{3}{U}: Draw a card.

Whisper Agent

Flash
When Whisper Agent enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Target creature gets -2/-2 until end of turn.

Choose one —
• Destroy target creature with mana value 3 or less.
• Return target creature to its owner's hand.

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Target creature gets -2/-2 until end of turn. You gain 2 life.

Flying
Acid Breath — When Black Dragon enters, target creature an opponent controls gets -3/-3 until end of turn.

Flying
When Psychic Symbiont enters, target opponent discards a card and you draw a card.