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My overexcited mind is coming up with something.
Take a look.
Rounds 1-4 – play as usual, conserve your hand, use glass cannons, etc.
Round 5 – Arandor nullifies the dancer.
Round 6 – BB full proc.
Round 7 – buff the dancer with evolve-BB, Ariette is coming, 20 damage to the face, the cockroach is screwed. Just need to make sure Ariette doesn't drop the buff; I haven't seen her do it much, and it shouldn't happen according to the description, it's not Urd.
Yes, I know Arandor can set up an OTK on round 6 by nullifying the cockroach, but the BB option seems more stable to me; it requires fewer cards. A full proc BB in the neutral forest seems like a not-too-difficult task if you don't discard your entire hand – glass cannons, DE, Circle, etc.
You can simply play BB evolve – Ariette according to the mana curve, and find some other way to deal the remaining 2 damage.
The downsides are wards, transforms, simply trading the entire board, etc., plus 2/2 on round five can sometimes be risky.
And you need alternatives, either a gentleman's valet set or just a cockroach or just a clown bolt.