The Amber and Amethyst deck is probably the easiest to master, while the Ruby and Emerald deck is the trickiest of the three to understand, although its probably the most flexible and adaptable of the three decks
The Amulet deck remained top tier even after various bans Summer Bloom, Once Upon a Time, Field of the Dead and its all due to this sick six drop creature
There are a lot of different uses for this in Modern and beyond, and you can expect to see this basically everywhere as a result
Since stores can ship European booster boxes to other countries in this region without issue (kind of like you can with states in the US), access to different languages like German, Russian, French, Spanish, and Italian is almost always at your fingertips, ensuring you can open cards in your preferred language without paying an arm and a leg for the privilege