Power Leak - Fourth Edition (Common)

Power Leak is a blue Aura from Fourth Edition that enchants another enchantment. At the start of the enchanted enchantment's controller's upkeep, they can pay any amount of mana, and Power Leak will deal 2 damage for each point of mana they don't pay, while allowing them to prevent some of that damage based on how much they choose to pay. This card can be a strategic choice in decks that focus on controlling the board or punishing opponents for their investment in enchantments, but it requires careful timing and knowledge of your opponent’s resources.