Last but not least, while this may seem like an oddly specific question, we figure its worth asking
Some people like to use art sleeves like the official Lorcana sleeves available and use d sleeves to protect these
Yu-Gi-Oh marks its 25th anniversary next year, Magic: The Gathering has just turned 30 and Pokmon celebrated its own quarter-century birthday just a couple of years ago
The reason for that bump in price, which has seen Beast Relentless becoming one of the most expensive Lorcana cards (that's not either enchanted or a promo) seems pretty straightforward
Whenever Sazh Katzroy attacks, put a +1/+1 counter on target creature, then double the number of +1/+1 counters on that creature.
Note that Challenger only applies when it is your turn, not when it is your opponent's turn