Coast Watcher

Fylamarid

Flying
Fylamarid can't be blocked by blue creatures.
{U}: Target creature becomes blue until end of turn.

Narwhal

Metathran Transport

Flying
Metathran Transport can't be blocked by blue creatures.
{U}: Target creature becomes blue until end of turn.

Sol Ring

Sway of Illusion

Any number of target creatures become the color of your choice until end of turn.
Draw a card.

Chameleon Spirit

As Chameleon Spirit enters, choose a color.
Chameleon Spirit's power and toughness are each equal to the number of permanents of the chosen color your opponents control.

Hibernation

Return all green permanents to their owners' hands.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Flash Flood

Choose one —
• Destroy target red permanent.
• Return target Mountain to its owner's hand.

Aven Smokeweaver

Part Water

X target creatures gain islandwalk until end of turn. (They can't be blocked as long as defending player controls an Island.)

Llawan, Cephalid Empress

When Llawan, Cephalid Empress enters, return all blue creatures your opponents control to their owners' hands.
Your opponents can't cast blue creature spells.

Weatherseed Faeries

Blind Seer

{1}{U}: Target spell or permanent becomes the color of your choice until end of turn.