Scrooge McDuck Resourceful Miser is a 4-cost Character with a 4|4 stat line, so it already is a good body to have on the board, and when played you can look at the top 4 cards in your deck and add an item card to your hand
Walking Cieth 2B Mutant Horror This creature enters tapped
These are co-op versions of the game , which feature unique mechanics and cards only playable in the Quests, as well as some specially-foiled alternate art cards included with the player decks
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The Emerald/Ruby deck gains its viability due to the Evasive cards featured in both decks, which are significantly harder to take out of play than the average card
Contrasting this, most versions of Madam Mim force you to return a character to your hand or banish her