Blue Mana Battery - Fourth Edition (Rare)

Blue Mana Battery is a four-mana artifact from Fourth Edition that allows you to generate blue mana by adding charge counters. By spending two mana and tapping it, you can place a charge counter on it, and later, you can remove those counters to add blue mana, effectively doubling your mana output based on how many counters you’ve stored. This card is useful in control decks that need to ramp up their mana for big spells or complex combos.