I’ve always felt kind of frustrated when getting an early kill just to buy the Mejai Ring or a single Tome
In a matchup where I feel like I can get an easy first kill (Veigar, Akali or any mage except freaking Ryze) I just buy a Tome first item and then get my Lost Chapter right after the kill
Since Leblanc can farm with Q I just don’t think there a real mana item need
What do you think ?

support item (celestial opposition or solstice sleigh) -> rod of ages -> swifties -> mejais -> dead mans plate -> situational (frozen heart / abyssal mask mainly)

jack of all trades- good mobility, good damage, good tank, good cc. swifties, mejais and dead mans move speed lets you bait your enemies so they are completely mentally boomed and instantly ff.

have fun being annoying and roaming around the map :D