Yes, they are tournament legal as part of the Scarlet & Violet series, unless otherwise noted by tournament rules
This is almost four times the price paid for the last Pikachu Illustrator, which sold in 2013 for $54,970
Bear in mind that card prices are prone to fluctuating wildly in the first week after release, as we learn many cards don't live up to the hype while a few hidden gems rise in price
While I like the Maison and spent not an insignificant time there back in the day, the fact that its just a carbon copy of what was in X & Y instead of something new is disappointing
Once that step begins, it's too late to do anything in order to cause this ability to trigger if you don't control a legendary Assassin
1 Yisan, the Wandering Bard Finally, the top spot of our ten best mono-Green commanders is held by Yisan, the Wandering Bard