This is my attempt at making the quest work.

I already had a deck based around the violet wurm mixing up the deathrattle hunter archetype with the unseen before token hunter one (see rexxar identity crisis ). Once Unseal the Vault got released I knew exactly what I was doing once I opened it.

For mulligan throw away the deathrattles except maybe one Rat pack You want your Seeping Oozelings to have targets. Try to keep secrets and maybe a Ramkahen Wildtamer to tempo out in case of emergency. The deck has very little early game so play accordingly.

Dire Frenzy should preferably be played on Rat Pack Violet Wurm if you manage to , the Timber Wolf or a Hound from Unleash the Hounds

Unless you already Dire frenzied or can immediately Dire Frenzy it, it is generally better to keep the Timber Wolf in hand for a surprise burst of damage from your tokens- they're all beasts, each and everyone of them.