Include that you don't lose lp and that your opponent doesn't need to target this card in the plus ;P
She's not bad at all, BUT
1) you need to have her face-up on the field
2) against swarm decks that's not a good idea...
Now. Think of such cards against swarm archetypes. Let's say Sams.
vs Krebons: if he doesn't get his Hand of the Six Samurai or LSS Mizuho then you might survive the turn with 4000 lp damage.
vs Naturia Butterfly: same, but you'll negate only one attack and might not survive.
Against scrap dragon? Meh. Monarchs? Meh. Sabers? Meh. I don't know...