Darksteel Monolith Indestructible
Once each turn, you may pay rather than pay the mana cost for a colorless spell you cast from your hand.
Reglamento oficial (Oracle)
[2023-07-28]You must still follow any relevant timing rules for the colorless spell you cast from your hand.
[2023-07-28]If you cast a card for an alternative cost of {0}, 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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rather than pay the mana cost for a colorless spell you cast from your hand.
