Implements Black Lotus, a zero-cost artifact with the activated ability: {T}, Sacrifice Black Lotus: Add three mana of any one color.

Implementation

• Card definition (lib/magic/cards/black_lotus.rb): Uses Artifact builder DSL with a custom ManaAbility that:

  • Costs "{T}, Sacrifice {this}"
  • Provides all five color choices (:all)
  • Uses amount 3 to specify adding 3 mana

• ManaAbility refactor (lib/magic/mana_ability.rb): Enhanced the base ManaAbility class to support configurable mana amounts:

  • Added amount class method to configure mana amount (defaults to 1)
  • Extracted validation logic into validate_choice! method
  • Updated resolve! to use validate_choice! and configurable amount

• Tests (spec/cards/black_lotus_spec.rb): Verifies mana generation, sacrifice mechanic, and multi-color choices

class ManaAbility < Magic::ManaAbility
  costs "{T}, Sacrifice {this}"
  choices :all
  amount 3
end

The refactored ManaAbility class provides a clean DSL pattern for configuring mana amounts without code duplication, maintaining backward compatibility with existing cards.

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