Released November 2, 2016 as the twelfth and final main expansion of the XY series, it returned to the beginning: nearly every card uses artwork from the 1999 Base Set (and a small number from Jungle and other early sets), updated for modern TCG rules
The most problematic part of the modern cards may actually be the wave of scalpers and collectors that hoarded card packs and endangered customers during the recent collection obsession.
This weakens their card economy while making you as greedy as Prince John himself
It's a popular enough ruleset to return once in a while in Japan, and challenges deckbuilders to reach deep into the cardpool for unorthodox solution to common gameplay patterns
Don't worry though, Sliver Hive is absolutely not worth its asking price
Sets started becoming smaller during the aughts, although 2007's Lorwyn bucked the trend with a mighty 301 cards