There is no hero out there that doesn't have issues with cosmic Kurse. My Ms. Marvel can handle it but if you get unlucky with those goddamn giants and everything in there that charges you just die. There is nothing you can do. Though I can pretty much face tank Kurse himself with her.
My storm has 16.5k hp, I have all her uniques but only use her slot 1 and slot 3 (bracers and cape). The other 3 slots are all cosmics with health/def/skills and invuln shield procs. Cosmic Control Rod for legendary, a shitty cosmic ring, Power Prism Shard, Pym Shrinking Serum, Maht's Arrowhead (for the spirit regen, though I don't need it in cosmics and should probably swap it out), Advanced Metasensory array. Ranged damage uru with River enchant, all artifacts enchanted with the 5% damage to bosses, 7 spirit on enemy kill blessing. Cosmic Doc Oc medallion, and about 300 of the area damage relics. I'm debating swapping out the Doc Oc for a Madame Hydra or Juggernaut medallion (hard decision because the increased radius is pretty awesome on Storm) and the Uru for a Defense Uru. Also debating swapping out power prism shard for another defensive artifact.
Core is a ~1600 hp, +1 Durability core with rank 1 and 3 +health affixes and rank 2 and 4 +dmg affixes. I really wish Life Leech cores were still around.
Build is:
Freezing Tempest, Crashing Hail, Lightning Storm, Spirited and Ball Lightning all maxed
1 point in Lightning Column just for the few times in X-Def when I need spirit, 1 point in Turbulent Winds, 1 point in Refreshing Breeze and 17 points (or thereabouts) in Quickening Breeze.
Lay down Crashing Hail everywhere, get to a safe spot, throw down a lightning storm hit Quickening and spam Ball Lightning. In Cosmics even blue trash dies in like 3 ball lightnings after Crashing Hail and Lightning Storm.
Alot of people think you should build more crit/brut and get Hela on her artifacts but she does a shitload of damage even with my measly 17% crit. She doesn't need it at all. When the damage meters were still around in X-Def I think out of like 100 X-Def runs only 2 people ever outdamaged me. Both were Hawkeyes somehow. The endless mana is much more important so you can spam Ball Lightning and throw down Lightning Storm every 3 seconds.