Changeling applies in all zones, not just the battlefield.

Kindred is a card type (like creature or instant), not a supertype (like legendary).

If the target creature is an illegal target by the time Crib Swap tries to resolve, the spell won't resolve. No player will create a Shapeshifter token.

While it appears only on cards that already have other card types, kindred is a card type and will be counted by effects that refer to the number of card types among cards in a zone.

This cards was originally printed with the "tribal" card type. That card type has been replaced with "kindred". This change does not affect the gameplay function of this card.

Kindred is a card type that allows noncreature cards to have creature types. For example, Echoes of Eternity is an Eldrazi (although not a creature) while on the battlefield and an Eldrazi card (although not a creature card) in zones other than the battlefield.