Muddle the Mixture

Counter target instant or sorcery spell.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Counter target instant or sorcery spell.
Transmute {1UU} ({1UU}, Discard this card: Search your library for a card with the same converted mana cost as this card, reveal it, and put it into your hand. Then shuffle your library. Play only as a sorcery.)

Ravnica Remastered

Counter target instant or sorcery spell.
Transmute {1}{U}{U}

Whatever you desire—
To MUDDLE
Or MIX...
I'm your fix.