All good things
It was clear that the game needed an evolution after many years with the exact same rules and card types, but the creators had to do it in a way that would still draw people to the game
Unique cards are predicted to appear in every eight boosters, and may feature different gameplay stats, abilities and artwork compared to their common counterparts, with certain effects being flagged within the algorithm to ensure gameplay balance
Hence, it really only sees play in Commander
The combination of mana cost, stats, enchantment typing and two powerhouse abilities make this almost as universal as Setessan Champion, and four of each is a decent place to start green Standard lists if you want to do anything with enchantments going forward
Last week, I discussed how Modern Horizons approach to card and set design fundamentally changed the Limited play experience in the first two sets