If the resolution of a triggered ability involves casting a spell, that spell can't be cast if a spell with split second is on the stack.
Sudden Shock
Split second doesn't stop triggered abilities from triggering, such as that of Chalice of the Void. If one does, its controller puts it on the stack and chooses targets for it, if any. Those abilities will resolve as normal.
Players may turn face-down creatures face up while a spell with split second is on the stack.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Vance Kovacs
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