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Blue Mana Control and Knowledge Blue mana, sourced from islands, represents intellect, manipulation, and the pursuit of knowledge

You can choose not to cast the copy

Emerge [cost] means You may cast this spell by paying [cost] and sacrificing a creature rather than paying its mana cost and If you chose to pay this spells emerge cost, its total cost is reduced by an amount of generic mana equal to the sacrificed creatures mana value. 2025-01-24 If you cast a spell for another cost rather than paying its mana cost, such as an emerge cost, you cant choose to cast it for any other alternative costs

It's likely they won't even make a meaningful dent in a semi-decent defence before being promptly vaporised