Looking to spice up the game with high pressure and high stakes? Use the following rules:

A tournament game is usually played as a best-of-5 series of duels between two players. If you have many players and a large bracket, reduce the number of duels as needed for time. (i.e all games before semifinals or finals are Bo1 or Bo3)
For each duel, prepare the 22-card game deck (20 core cards + 2 random cards from the special deck)
It is not mandatory to flip Wolfy (as there is risk of flipping the wrong card)
You should ideally have a dedicated dealer / referee for the game so that the identity of the of the hidden special cards is not accidentally revealed while shuffling.