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While you could use any energy type to fullfil these requirements, a Double Colorless Energy would provide two energy in a single turn

Rarity : Rare Cost : N/A Colour Identity : Colourless Usage : Provides access to any colour of mana needed while potentially punishing the controller with life loss

Its second Attack is Extreme Current, which deals 180 HP of damage for just two Lightning and one Colorless Energy

but it can also brick very hard

And thats where the problem lies today

Number 134 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pauper, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Standard Rulings (10/4/2019) You must sacrifice exactly one creature to cast this spell