this item is stupid. Theres no reason to build it, why does it still exist?
Proposed change:
Sunfire 425hp 50 armor.
For every minion killed by sunfire, and every time you deal damage to a enemy champion with sunfire, you generate 1stack of "Inferno". at 250 stacks Sunfire Cape gains an on-use effect to double its radius and quadruple its damage for X seconds. Upon expiration, deal additional damage to nearby enemies.
Khabith2 votesI like the concept, but it seems very odd to get, also sun fire cape is already a great item to rush against AD top laners, because of the nice damage (Wave clear) and the armor. So giving it that will not do too much beside buff tanks....
Mcnilesderp2 votestanks dont need more damage plz no
Der Lindwurm1 votesIt should have CDR again.
PhearBunny1 votesThe problem with it is, its not useful for anything but waveclear. Its essentially a useless item for mid-late game. Leaving little to no incentive to build it at all. My idea behind having it reach a stack count and become a usable item, is so that it transitions into late game and isn't just wasted gold.
jocomotion1 votesGive it grevious wounds and take it off Thornmail?
ArfBarkBoof1 votesI would say just make it stackable again but that would make insanely stupid stuff like 
with three Sunfire Capes and Dark harvest happen.