Darksteel Monolith
Artifact
Oracle Text
Indestructible Once each turn, you may pay
rather than pay the mana cost for a colorless spell you cast from your hand.
Rules for this card
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A keyword ability that precludes a permanent from being destroyed. See rule 702.12.
Rulings (2)
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Wizards of the CoastIf you cast a card for an alternative cost of, you can't pay any other alternative costs. You can, however, pay additional costs like kicker. If the card has any mandatory additional costs, you must pay those.
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Wizards of the CoastYou must still follow any relevant timing rules for the colorless spell you cast from your hand.