If you already have a Skullclamp on the battlefield or in your hand, other good targets for these tutors would be your token generators or one of your sacrifice outlets
Whatever they get down to, they will rebound fast
For example, if the four players in your game reveal 4, 7, 7, and 7, Wheel of Misfortune will deal 7 damage to each of the last three players and those three players will discard their hand and draw seven cards.
Beckett is the hardest grader
Opt is another subpar cantrip
There are just so many cards that work well with Birgi that you can capitalize with something as simple as Burning Prophet and Guttersnipe, or as complex as Defiler of Instinct