Exile target nonartifact creature you control. It perpetually gains "This creature enters the battlefield with an additional shield counter on it." Then return that card to the battlefield under its owner's control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Addendum — If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control.