Probably the most powerful gimmick deck built for the League has been the Orcish Artillery combination decks, which run about 10 copies of the Artillery (this was prior to the institution of a 6-card cap for uncommons), and a half dozen copies of Circle of Protection: Red
Firstly, you get twice the value off cards like Esper Sentinel, Charismatic Conqueror, and Mangara, the Diplomat
The Mirrodin era flavor text always cracked me up: Reinforcements or refreshments
During your opponent's next turn, any damage done by attacks from the Defending Pokemon is reduced by 30 (before applying Weakness and Resistance)
The extra life from Towns is actually relevant too, since Starting Town and Midgar are both valid options in the deck
Step forward, the 30th Anniversary Set