MAGIC: THE GATHERING
Choose one -
* Counter target spell.
* You may choose new targets for target spell.
* Copy target instant or sorcery spell. You may choose new targets for the copy.
It's always good to have options, and a modal counterspell is many blue mages' dream come true. With Insidious Will, you can choose to sabotage one of your Commander opponents, or just say "no" to their game-winning spell.