[hcobb]

Whip only blocks spells of the Wizard's IQ or one less (ITL 142) so for an average starting wizard that's IQ 17 and 16 spells.

Here's a human whip wizard build with blocked spells noted.

ST 8, DX 11, IQ 13, MA 10
Whip(1d-1), Silver Dagger / Staff III (1d-1/1d)
Common, Knife, Literacy, Whip
Aid, *Drain Strength, (*3-hex) Fire, *Flight, Illusion, *Staff III

Note that he has to put away the whip to make a new Staff III, but not to use the occult blast and can cast 1-hex fire without restriction.