It's a Trap Raigeki (most of the time, your opponent's monsters won't have an A-Counter until your turn unless you have Kid or recently played PPV) and generates free counters on everything your opponent Summons, which is nice for turning Telepath into MST or even a sudden Brainwashing Beam, though Beam is kinda situational
Once she is destroyed by battle, she can Special Summon any "Valkyrie" Monster from the Deck
Major update: Katy Perry V and Post Malone V have been revealed on the official Pokemon 25 music site
You also have the ability to turn any Iroas-led combat into a Sweep and Keep situation where you cast Starstorm or something after swinging all out
You can only use each effect of "Tri-Brigade Kitt" once per turn
At seven mana, it should be worth three and a half ThaliaThalias or Thorn of AmethystThorn of Amethysts, two Grand Arbiter AugustinGrand Arbiter Augustins, or two Dovin, Hand of ControlDovin, Hand of Controls, and it barely adds up to being better than one of any of them