Sewer Crocodile

{3}{U}: Sewer Crocodile can't be blocked this turn. This ability costs {3} less to activate if there are five or more mana values among cards in your graveyard.

Ashiok's Skulker

{3}{U}: Ashiok's Skulker can't be blocked this turn.

Kraken's Eye

Whenever a player casts a blue spell, you may gain 1 life.

Sun Droplet

Whenever you're dealt damage, put that many charge counters on Sun Droplet.
At the beginning of each upkeep, you may remove a charge counter from Sun Droplet. If you do, you gain 1 life.

Phantom Ninja

Exclude

Counter target creature spell.
Draw a card.

Tandem Lookout

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Tandem Lookout is paired with another creature, each of those creatures has "Whenever this creature deals damage to an opponent, draw a card."

Crippling Chill

Tap target creature. It doesn't untap during its controller's next untap step.
Draw a card.

Counterspell

Archetype of Imagination

Creatures you control have flying.
Creatures your opponents control lose flying and can't have or gain flying.

Phantom Warrior

Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.

Tempest Djinn

Flying
Tempest Djinn gets +1/+0 for each basic Island you control.

Threads of Disloyalty

Enchant creature with mana value 2 or less
You control enchanted creature.

Warkite Marauder

Flying
Whenever Warkite Marauder attacks, target creature defending player controls loses all abilities and has base power and toughness 0/1 until end of turn.

Curate

Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Draw a card.

Fogwalker

Skulk (This creature can't be blocked by creatures with greater power.)
When Fogwalker enters, target creature an opponent controls doesn't untap during its controller's next untap step.

Ever-Watching Threshold

Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card.

Nightwhorl Hermit

Vigilance
Threshold — As long as seven or more cards are in your graveyard, Nightwhorl Hermit gets +1/+0 and can't be blocked.

Thalakos Mistfolk

Shadow (This creature can block or be blocked by only creatures with shadow.)
{U}: Put Thalakos Mistfolk on top of its owner's library.