If you take battle or effect damage while this card is in your GY: You can place this card from your GY in your Spell & Trap Zone as a face-up Continuous Trap
1 Trainer is the most expensive Pokmon card and can cost about 100 000 dollars for one card.
As for strategy goes I would use Hyper Claws mainly, unless your opponent has some strong Pokemon on their bench, because this way you can inflict damage every turn with Hyper Claws and in two turns Hyper Claws can do at least 140 damage which will knock out just about anything and if their Pokemon is over 140 hp then use Electromark and then Shock-wave
The best part is that the set is inexpensive compared to the value of previous expansions, meaning it's great if you're on a budget
These tournaments play a number of rounds, where players will play a standard game against each other and wins and losses will be recorded
Fascinating and versatile cards appeared in sets like Duskmourn: House of Horror (DSK), Outlaws of Thunder Junction (OTJ), and Murders at Karlov Manor (MKM)