I don't see how you can do that in two rescues and one side battle but I could be wrong.
Jonathan wasn't saying he could do the full discard in one turn but rather that he can set it up in one turn.
Sort of. It is possible to do in one turn but in practice would probably require a turn to help set it up.
Basically: You rescue with Jacob, play Obedience of Noah, choose an immune guy to block, play Coat of Many colors, play The Long Day, Play Tithe and place Obedience of Noah on a hero in territory, play Search and search for the rest of your Searches and Book of Jasher's, then play Stillness to get them back and make the next rescue. There are of course many variations in exact play and order.
In the next attempt, you use your searches to get what you need to repeat the process. You probably get Increasing Numbers? to place 2 heros in territory, search for another immune blocker, Moses and Elders or Jubilee to get what you need out of discard, Taking Egypt's Wealth or Third Heaven? to clear opponent's hand, card of choice to clear evil characters in their territory, etc. Once you've got what you need, then on the 3rd or 4th attempt you get 4 copies of Warriors Spear? and start discarding their deck. At 8 cards at a time, it might take 10 more cycles to get rid of their deck.
The previous version was far more efficient, faster, had more options, could include 5 copies, and didn't have as many cards that could stop it (Covenant with Death, Iron Pan, etc).
I built it, but I haven't bothered to play it because I doubt it will work very often and if I somehow miraculously got it to then they will just change something else to stop it. Good luck to you if you find a combo deck that does work!