Transforming Flourish #79
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Card Details
Demonstrate
Destroy target artifact or creature you don't control. If that permanent is destroyed this way, its controller exiles cards from the top of their library until they exile a nonland card, then they may cast that card without paying its mana cost.
Illustrated by Xavier Ribeiro
Rulings (7)
Apr 4, 2025
If the destroyed permanent's controller chooses to cast the exiled card without paying its mana cost, they can't choose to cast it for any alternative costs. They can, however, pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.
Apr 4, 2025
If the exiled card has 
in its mana cost, the destroyed permanent's controller must choose 0 as the value of X when casting it without paying its mana cost.
Apr 4, 2025
If the spell requires targets, you choose the target of the original spell as you cast it. If you create a copy of the spell, you may choose new targets for the copy as you create that copy. Similarly, the opponent you chose to create a copy may choose new targets for that copy as it's created. In other words, your opponent will know the targets of your original spell and your copy when choosing the new targets, if any, for their copy.
Apr 4, 2025
If you cast a spell with demonstrate and both you and an opponent copy it, the opponent's copy will resolve first, then your copy will resolve, and finally the original spell will resolve.
Apr 4, 2025
If you cast the spell and choose not to copy it, no opponent will get to copy it either.
Apr 4, 2025
If you copy a spell with demonstrate, you then immediately choose an opponent. If they copy the spell, it goes on top of the stack.
Apr 4, 2025
You choose whether to make a copy as the demonstrate ability resolves. This happens before the original spell resolves. Your copy goes on the stack above the original spell.
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