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They have a one-time effect

They can't be Kaiju'd, unless the opponent specifically has the right Attribute Kaiju

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Do jump starters have other functions

Green, blue and white cards in particular tend to be excellent at resisting Exile-based spot removal, whereas black and red cards have far fewer options available

For example, if you control Johann, Apprentice Sorcerer ("Once each turn, you may cast an instant or sorcery spell from the top of your library") and Kellan, Daring Traveler is on top of your library, you can cast Journey On, but not Kellan, Daring Traveler