Boomsday 'Never Go Full Northshire' Seems Unsolvable

Final lethal puzzle. Here’s what I’ve done which seems correct.

  1. Play Elven Archer on Sylvanas.
  2. Play Treachery on Sylvanas.
  3. Play Power Word: Shield on opponent’s Northshire Cleric.
  4. Play Wild Pyromancer.
  5. Play Undercover Reporter on Northshire Cleric.
  6. Play Battery Pack.
  7. Play Fungal Enchanter.
  8. Play both drawn Northshire Clerics.
  9. Play Binding Heal on a full health minion.
  10. Play The Swap.
  11. Here Sylvanas will trigger, giving the opponent the maximum 7 damaged minions with 4 Northshire Clerics. Then finalize with the Circle of Healing.

This doesn’t do 999 damage, it takes Boom down to 503 health.

Thoughts? Am I misplaying this in some way? I know it used to be different minions and different health over the years.