All players need to go into the battle in the first round, in the correct order, without being late. That is quite tricky but do-able. Your hitter must be in the third position, and your player with the Dalia hat must be in the fourth position. The players in the first and second positions are interchangeable.
Each player should have no more than seven cards in their deck, and everyone will need a different stackable blade. Your support Wizard should have a Feint as well as Indemnity enchantment on hand. The Indemnity prevents Prince Viggor from removing the Feint with a cheat.
Viggor and his Ice Minion also like to cast a -55 Tower Shield. So one support Wizard should have TC Shatters or Pierce on hand. They will cast Shatter or Pierce in the second round rather than blading. You’ll still kill without the extra blade, but you won’t have a chance without removing the Tower Shields.