Legendary, basic, and snow are supertypes, not card types
Thats an outrageous bit of value attached to one of your characters and it also protects you against the classic one-two punch of the meta defining ruby-amethyst control deck of set two, which would wipe your board with Be Prepared and then answer the first character you play with a Lady Tremaine which would force you to sacrifice it
Best Cards + Mulligan Strategy Anna Eager Acolyte is excellent, and can Shift into Anna Mystical Majesty
A staple for control decks, this card is a reliable character removal tool, being able to send exerted characters to a player's Inkwell, an incredibly powerful ability which is difficult to counter
The exception here is that your one or two high-mana cards can be unique rares, since you don't want to run too many high-cost cards anyway