Flying
Creatures you control with flying have "Spells your opponents cast that target this creature cost {2} more to cast."
An opponent’s spell that targets a single creature with flying you control more than once costs only {2} more to cast. An opponent’s spell that targets multiple creatures with flying you control costs {2} more for each of those creatures.
Jubilant Skybonder’s last ability applies to itself as long as it still has flying.