Ally of Justice Kaibaman

•Call of Justice {3}{w}{w}{w}+ sacrifice this creature: special summon a card named Blue-Eyes White Dragon from your hand.
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Formula: Blue-Eyes White Dragon 8/7 cost 8 manas. To call cost 1 mana less, considering the
sacrifice count as 1 mana less:
***cost 8-1-1 = 6 manas
(formula based on Dragon Ball TCG)