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.
Take Possession
After a spell with split second resolves (or otherwise leaves the stack), players may again cast spells and activate abilities before the next object on the stack resolves.
Players still get priority while a card with split second is on the stack; their options are just limited to mana abilities and certain special actions.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Michael Phillippi
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