Design philosophies like this are great for the players and vital for MTG 's longetivity, and adding Planechase to Doctor Who is certain to pay off for WotC
Braids, Arisen Nightmare is one of the purest forms of Mono Black Aristocrats you'll come across: like Baba Lysaga, Night Witch, Braids is a powerhouse card draw engine that drains opponents, but unlike Baba we aren't jumping through hoops to get our value, we're just playing a classic Aristocrats list that happens to gain crazy value from our commander but isn't built entirely around her
Legality depends on the tournament format -- Skyknight Vanguard can be legal in some formats and banned or restricted in others
Based on the latest market prices tracked on TCG Stacked, Foil is worth about $1.96 USD
Like Artifacts, there are plenty of cards that can only target Enchantments or synergise with this MTG card type
It's not flashy, but just works