karma, useless? i don't know what you took but it was good one i think...

update it

Sejuani became underplayed because of 2 things that made her look pretty bad:
A. She was played jungle which is reealy a bad place for her as she has no lifesteal/spellvamp or even booster Dmg Shield. Lack of those forces her to go B and waste tons of time after every 4th camp or single gank as she drops low after those, or waste gold on tons of pots which makes her fall behind in builds. If ability to gank is enough to become a jungler than why noone plays jungle Kassadin, Ezreal or Lulu? Think on it ;)
B. Very, very wrong builds that were not only makin' her just half tanky but also cuttin' 80% of her dmg.
The thing that should let Sejuani make a big comeback is that Health givin' items r even cheaper now than ever and most of her dmg comes from her "W"-NorthernWinds which scales with her max HPs amount up to beein able to deal 1.8kdmg over 6 seconds with just that single skill every 6-10 second based on ur cooldowns, add another 1k dmg with other skills, while beein' ultimately tanky and nearly unkillable if ur teammates know when to follow up, plus she can outCC and chase after nearly every single champ, includin' Singed and Darius ;)

you can add Galio, Sion, and Zilean