I've been workshopping a Custom Party leader with an effect that could reshape the game for anyone, Good or Bad. This is what I've come up with. (Sorry to Post this here but the "Custom Party Leader thing on the website doesn't allow for this many characters for its effect.)

Master of Chaos

Any Player may activate the effect of Master of Chaos by spending 1 Action Point provided they have not spent any Action Points this turn.

Roll 2 Dice and Apply the appropriate effect (This Roll is unaffected by any and all Roll Modifiers)

2: Discard 1 Card, Sacrifice 1 Hero, remove any remaining Action Points, You cannot gain more this turn.

3: Discard 1 card

4: Discard 1 card, Draw 1 card

5: Sacrifice 1 Hero

6: Gain 1 Action Point

7: Draw 2 Cards

8: Destroy 1 Card

9: Steal 1 card

10: Look at the top card of either Deck

11: Remove any remaining Action Points, You cannot gain more this turn.

12: Slay 1 Monster, Ignoring any Attack requirements

Edit: Formatting and Wording