Played at the beginning of the player's turn, this card is not discarded. It affects all players and remains in effect until any other rule card is played. All cards that require a 'Draw and discard noting the last digit', now require that a die roll of 1d10 be used instead.
Copyrights:
TSR
Wizards of the Coast
Hornung's Randomness is an interesting card that can do what was originally intended with making cards random in the Forgotten Realms set, and make them also more dangerous.
Any card requiring checking the last digit of a randomly draw (or drawn and discarded number) instead requires a roll of a ten sided die. Therefore, many combos from deck manipulation are no longer effective, such as Moraster (339/4th) with The Fates (23/BR-chase).
A roll of a d10 could add a rondomness to those cards that were getting back to the original intent of the cards. However, the roll of the d10 has another interesting effect. It has been ruled that any 0's rolled on a d10 are counted as 10's.
Most cards are designed with 0-9 as possible options, and making it 1-10 makes some cards nastier (average roll is 5.5, versus the regular 4.5 average). Examples include The Fates (having to discard 10 cards!), Bess's Revenge (159/4th) (higher level likely to kill), and The Black Death (26/NS). However, some cards also get weaker, like Vorpal Blade (56/FR) or Use Poison (63/NS), since it is harder to hit a certain number or lower.
I wouldn't expect to see this card in tournaments often, since most tournament quality players need to trust their cards will work, and will usually use the random cards with a fixing agent of some kind. However, this will probably pop up in lots of fun games, and the chaos this card is likely to cause make fun games even more so. The standard methods of removing rule cards are effective counter measures to this card.
