Look at these cards...

[Pokekid]

Trainer: Russian Roulete

Roll a dice. If you get a even number the defending Pokemon is dead. If it a odd number your active Pokemon is dead.

Trainer: Slot machine

Flip a coin. If heads take off 3 damage counters off your active pokemon. If tails take 3 damage counters off the defending pokemon.

 

[GuardianTIM]

Um, perhaps that should read "Knocked Out" instead of "Dead".
Also, on most of the cards, they read "remove X damage counters from..." (where X is a number)

I do like those cards - the only other edit I'd make is make Russian Roulette a Supporter card, and something on it saying you can only have one of those in your deck, or something like that. After all, if they had 2 EX pokemon, and you played your 4 R'Roulettes, you could pick up 6 prizes in one turn if you got the roll right.