Mishra's Workshop
Land
Oracle Text
: Add 
. Spend this mana only to cast artifact spells.
Rulings (4)
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Wizards of the CoastThis mana may be used on additional costs to cast the spell, such as Kicker.
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Wizards of the CoastYou can spend the mana on costs on the spell's text.
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Wizards of the CoastThis mana may not be used to pay costs imposed after the spell is initially cast.
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Wizards of the CoastThe mana can't be used to pay Echo costs.