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Quiet Speculation
{1}{U}
Sorcery
Search target player's library for up to three cards with flashback and put them into that player's graveyard. Then the player shuffles.

Rootwater Thief
{1}{U}
Creature -- Merfolk Rogue
1/2
{U}: ~this~ gains flying until end of turn.
Whenever ~this~ deals combat damage to a player, you may pay {2}. If you do, search that player's library for a card and exile it, then the player shuffles.

Spellshift
{3}{U}
Instant
Counter target instant or sorcery spell. Its controller reveals cards from the top of their library until they reveal an instant or sorcery card. That player may cast that card without paying its mana cost. Then the player shuffles.