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This is my favorite concept deck, named "ULTIMA".
Ultima is a control drain-life deck. The "ultima" concept is to slowly reach a power level so extreme that most defenses become worthless.
Exponential mana growth (Cabal Coffers , Crypt Ghast ), card advantage (Phyrexian Arena ), control spells/continual life gain, and finally a massive multi-opponent non-targeting and non-preventable drain-life (Exsanguinate and Kokusho, the Evening Star ).