Do you mean top 20 as favorite or top 20 as most powerful?
Favorite
Oh. My top 20 was most powerful.
What are your favorite?
Largely the same ones.
Not in any particular order anymore because I'm lazy:
King's Court
Goons
Masquerade
Bridge Troll
Bridge
Ambassador
Wharf
Pooka
Groundskeeper
Remake
Fortune
Junk Dealer
Loan
Lookout
Minion
Border Village
Artisan
Forge
Royal Carriage
Vampire