Willbender | Magic: The Gathering
Formats Willbender is Legal in
Official Oracle Text for Willbender
When Willbender is turned face up, change the target of target spell or ability with a single target.
Official Rulings for Willbender
4/15/2013 : If a spell with split second is on the stack, you can still respond by turning this creature face up and targeting that spell with the trigger. This is because split second only stops players from casting spells or activating abilities, while turning a creature face up is a special action.