User blog comment:Leyrann/Why Chalice of Harmony is OP/@comment-83.208.159.162-20120828181447/@comment-4893919-20120902180335

Early catalyst will gve you much more profit that chalice + dorans. As Swain you want to get to mid game with RoA and bully almost everyone with your sustain, harras and very damaging combo potential w/ ignite. You regen mana with lasthitting and regen is not so useful as early mana pool. With early chalice you can simply run out of mana in middle of your combo, regen doesn't help with that problem.