You can't cast Curtains' Call without two creatures to target. If one becomes an illegal target after you've cast Curtains' Call, the other will still be destroyed.
2016-11-08 · Wizards of the Coast
Causing an opponent to lose the game after you've announced that you're casting a spell with undaunted and determined its total cost won't cause you to have to pay more mana.
2016-11-08 · Wizards of the Coast
Effects that reduce what you pay to cast a spell don't affect its mana value.
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