Actually you would copy
spellseeker again when you
unearth it, so you would have 2 more tutors on the stack, 2 black floating,
spellseeker and 2 token copies with haste on the field. It seems like a good sequence to increase your storm count, assuming you had enough mana to begin with to do something with the next 2 spells you tutor. I mean you would need 3UB to get the sequence running to begin with.
One thing I would try to fit into this deck would be
Turnabout and
Reiterate. Together with enough lands they can give you recursive mana and an arbitrarily large storm count.
Turnabout on its own can lead to an explosive turn, and
reiterate can enhance a huge number of other plays.
Also
Azami, Lady of Scrolls could allow you to tap the wizard copies for card draw before you lose them at end of turn.