scarlet and violet obsidian flames booster box Pokémon TCG & Violet: SV03 a new take on a returning game mechanic Pokémon Obsidian Flames Booster Pack

Gym Leader Challenge is a popular example and is one of many listed in the Alternative Play Handbook linked below

Whats great about this card is that you can sacrifice any number of artifacts that you have on your battlefield to tap creatures on an opponents side equal to the artifacts sacrificed and to draw that many cards

Having fulfilled the condition of digivolving into a [Puppet] trait Digimon, Arisa declares that she'll use her 2 Tamer cards

the out of faction card you buy better offer you something especially powerful for your investigator

It can really turn people off, and even if its a fair tactic to a certain extent, it will make you enemies