I was thinking about this more and I'm wondering about the following:

Swap out 2x Shapeshifters for 2x blades.
Swap out Finnian for Martyr!

Martyr is weak, so it should still be easy to Charm your main target. Sacking her followed by something like a 6/5 manticore (who comes back to hand to be charmed again) has got to be a game-winner, right?

Swapping out shapeshifters for blades doesn't mess with my curve quite as bad as taking out something like hogs. And of course Blades have to be worth the 1 extra mana given their effect. Hidden is nice, but Ferals pinging for 1 dmg doesn't remove a Guild Enforcer.

The downside is that I'm significantly decreasing the synergy with wildfire.

After playing Trial of the Hydra a bunch, I strongly prefer Sudden Bloom. Trial is a dead card far more often. Sudden also works with Blades and Enforcers.