Standstill
Enchantment
Oracle Text
When a player casts a spell, sacrifice this enchantment. If you do, each of that player's opponents draws three cards.Rulings (1)
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Wizards of the CoastIt only works once. If someone casts another spell after it triggers, but before that trigger resolves, then it will trigger again. The first time one of these triggers resolves, it will be sacrificed for the full effect. Any additional triggers on the stack will do nothing when they resolve because you will be unable to sacrifice it additional times.