Jasmine's "Reflecting Beam" (purple ability) says, when at level X, "Dispel abilities cast by heroes under level X."

Since Jasmine never gains an ability level bonus from her equipment, does this mean that Jasmine's 4th ability becomes useless against level 90 teams when she is also level 90? This severely weakens the character once she hits the max.

XD, have you played this game at lv90? Jazz is easily the new best hunter in the game.

She's ok. None of the top players in server 5/6 uses her anymore though

The healing buff/debuff works, dispel I'm not so sure. There aren't many buffs in the game to begin with so it's an ability you notice extremely rarely (at least I haven't seen it work once).

Jasmine works, I think it's just a wording issue.
Jasmine shows up in EA from time to time. Either paired w/ firehawk or in a anti aoe set up.