Jasper, King of All

You have, "At the beginning of your upkeep, or whenever an opponent becomes announced (this excludes your knight), you may exile the
top card of your library. You may play that card
until the end of your next turn." and "{3}: Copy
target instant or sorcery spell. You may choose
new targets for the copy. You may use this
ability once per game. You may use this ability
an additional time for each announced knight."