Lore is essentially a victory point, with the goal of Lorcana being to reach 20 before the opponent to secure the win, so having four Lore is nothing to sneeze at
Lady Tremaine, Imperious Queen, is a Shift card meaning that it can be played at a reduced cost if you already have another Lady Tremaine card out, which is placed on top of and takes on all existing tokens from that
A five mana planeswalker can generate unconditional (singular) card advantage on a plus
The ability to answer problematic artifacts is great for decks like Phoenix, which already want to play Anger but worry about hitting their own creatures
I also love creatures that sacrifice themselves for value, like Selfless Spirit, Bulwark Ox, and Cathar Commando, for the deck
Although Clarabelle played a major role in early Mickey Mouse shorts and other classic material, she's been largely forgotten in the modern age