Mono U prevent

: Target spell or permanent becomes the color of your choice until end of turn.

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

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 Deadeye Navigator is paired with another creature, each of those creatures has ": Exile this creature, then return it to the battlefield under your control."

Flying When this creature enters, untap up to five lands.