That's right, seven cards, at the same time, all perfectly legal and useable (though not until Round 5...). Let's get down to business, I'll explain this all thoroughly, but for now, here's all the cards you need:
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Cards used from discard pile
Deed of Emancipation
Kawanakajima
Tomahawk
Horn Bow
Fernando II de Aragón
Donn Cuailnge (or any other Special * Ally card)
Good Queen Bess (or any other Inspiration * Ally * Female card)
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The Deck
Finn MacCumhaill
Johnson's Army
Loki
Ye Dirty Swabs! (or any other "You may use another Special/Armor" card that doesn't require hands)
Qing Gong Palace
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Granted, this will only work if your opponent has a face-up weapon on Round 2 and Round 4, which won't be easy, because you're discarding his first weapon Round 2. Here's a round by round explanation.
Round 1: Nothing has to be done. Heck, Johnson's Army is an Ally, so you could reveal another card and replace it with this one if you want to get fancy.
Face-up cards at end of round: (1) Johnson's Army
Round 2: Swap JA with your opponent's weapon. Use Finn's ability to discard your opponent's weapon for Fernando. Discard Loki for Tomahawk, and discard Tomahawk for Hornbow (you don't have to do this on Round 2, but it must be done on Round 3 at the latest). Get JA back at end of round.
Face-up cards at end of round: (3) Johnson's Army, Fernando, Horn Bow
Round 3: Nothing has to be done, just make sure you put Loki and Tomahawk back in the discard pile.
Face-up cards at end of round: (4) Johnson's Army, Fernando, Horn Bow, Ye Dirty Swabs!
Round 4: Bring back Loki with QGP, give your opponent JA or Hornbow for their weapon. Use Finn's ability to discard your opponent's weapon for Donn Cuailnge. At the start of your turn, discard Loki for Tomahawk while bringing back Kawanakajima. At the end of the round, discard Horn Bow or Tomahawk (whichever one you didn't give your opponent) to bring in the Deed of Emancipation from the discard. Get your weapon back.
Face-up cards at end of round: (7) Johnson's Army, Fernando, Horn Bow/Tomahawk, Ye Dirty Swabs!, Donn Cuailgne, Deed of Emancipation, Kawanakajima
Round 5: Fernando is still useless, so at the start of the round, discard Kawanakajima for Good Queen Bess, and if you still have Horn Bow, ditch it for Tomahawk. Now you have 7 face-up support cards that are all perfectly legal and can all be used.
Face-up cards at end of round: (7) Johnson's Army, Fernando, Tomahawk, Ye Dirty Swabs!, Donn Cuailgne, Deed of Emancipation, Good Queen Bess
I think that if you can pull this off, it should be an automatic win, you deserve it.