Solemn Judgment was a popular deck staple for years before eventually being banned in 2013, but it became limited in 2018, and as of 2019, is unlimited, being the first Counter Trap card to have been on each of the respective lists in that order.
According to EDHREC, Retether is in 9,428 decks, most commonly in (Im sure you see the trend developing) Light-Paws, Emperors Voice (2,994 decks) and Uril, the Miststalker (1,270 decks)
Merida, Wisp Conjurer Amethyst I'm a firm believer that there are no bad Merida cards in Disney Lorcana, and this new one in Attack of the Vine continues that trend
Each of the non-Xyz Beast-Warriors from this theme adds its ATK, DEF, and a special effect to the Xyz Monsters and there are lots of ways to add more Xyz Materials