Kicker {3}{U} (You may pay an additional {3}{U} as you cast this spell.)
When Elvish Hydromancer enters the battlefield, if it was kicked, create a token that's a copy of target creature you control.
If it was kicked, Elvish Hydromancer’s ability can target any creature you control, including itself. If it targets itself, the token that is created won’t have been kicked, so the ability will not trigger again.