Rageblade gives less Attack Speed than its components...
It builds out of recurve bow which is 25% AS but has 0% base AS, and only gets past the 25% once you have 4 stacks (8%/stack).
It would make more sense to make
give 25% base attack speed and the stacking to just give 4%/stack instead. It just about evens out at max stats but you arent losing Attack Speed when you upgrade the item anymore

+
=
, yet no mana regen.