Lich Bane early game buff (doesn't effect late game)
starts at 150% base ad (-5% per 30ap down to a maximum of - 75% at 450 ap)
trinity force has 200 of base ad. 50% of about 75 ad is 37.5 lich bane gives 80 flat ap which gives spellblade plus 40 extra damage from the 50% ap ratio.
okay it with runes and masteries it might be a bit too strong at 150%, but you get my drift. how about make it start at 125%.
the problem with the old lich bane was it's late game power. the nerf handled that but didn't factor how the nerf might effect its early game. Its not very viable as a first item pick and midgame it's underwhelming.
this suggestion should help breathe some back into it.
better numbers might be 125% base ad (-5% per 30ap down to a maximum of -75% at 300ap)
at 75 base ad x 125% = 93.75 versus 56.25 with the current 75% ratio. that's a difference of 37.5 extra damage.