This is my personal pick for the most powerful card in Inquisition, edging out Slap! (78/IQ), The Apocalypse (47/IQ), and Etarkine (31/IQ).

This AD&D realm allows you to attack the pool, not just realms. Not just that, but the opponent must defend and grant spoils if defeated, so speed rebuilding never comes into effect. This makes it possible to remove some of the most hated champions from the game, like Necba the Wrathmaker (14/DU-chase), Manshoon of the Zhentarim (6/RR-chase), and Chernevik (347/4th).

This especially strong with good instant win champions, with my personal favorites being the Living Wall (58/PO) and the Earth Elemental (60/PO). Other good combos with the Arena of Dori the Barbarian include Gloriana (3/1st-chase), Lovely Colleen (22/1st-chase), the Living Scroll (408/2nd), The Undead Htimsen (425/3rd), Mayor Charles Oliver O'Kane (433/3rd), The King of the Elves (440/3rd), Bilago Lumen (17/PO), Lyr of the Mists (23/PO), Corpse Dragon (82/UD), Rhuobhe Manslayer (14/BR-chase), and Dragon Hatchling (8/DR-chase).

Remembering that opponent's don't have a choice to fight or not means all cards that send them back defeated means discarded. Not only does this card give you a chance to wipe out the opponent's most annoying champions quickly, it also gives you many spoils, boosting card advantage.

However, it must be remembered that this is a two edged sword. ANY player can use this power, so champions like The King of the Elves or Living Scroll may not be the best choice, since those cards can be just easily killed as they can kill.

A good defense against this card is to play with a hidden pool, making choices random and less easy to assure spoils.

This is definitely a very high power card that work its way into many strong tournament decks.