Bug - Great Hall of the Citadel / Isildur's Fateful Strike
I was in the middle of a game in Premier Draft and I tried to use Great Hall of the Citadel to generate mana to cast Isildur's Fateful Strike (I needed 1 extra black mana and Isildur's Fateful Strike says Legendary Instant). But the game would not let me use the mana from the Citadel to cast that spell. Citadel does not say that you must use the mana to cast legendary creatures so it should work for the Legendary instant as well.
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[Deleted User] commented
To cast legendary instants and sorceries you have to have a legendary creature or planeswalker on the field.
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mmehta#31209 commented
I was in the arena open qualifier and tried to cast isildur's fateful strike as an instant and it wouldn't allow me to at any point in the game...