If a creature is "creature shapeshifter" and the body says changeling and it is in the graveyard, Can I for example use "remove an assasin from graveyard" targeting the creature
Yes, you can do that. Note that it doesn't matter that the printed creature type is "Shapeshifter". All that matters is that it has "Changeling" and that Changeling works in all zones. It just so happens that all Changelings are printed as Shapeshifters.
Changeling is a characteristic defining abilty. As such it works in all zones and even outside of the game. So yes, a card with changeling is an assassin card in the graveyard, as well as a zombie card, goblin card, dragon card, plant card, etc.
Note, that you don't target the card you exile with Scarblade Elite, only the creature to destroy with the ability.
The changeling ability is what is known as a charecteristic defining ability. Unlike most static abilities on creatures CDA do work in all game zones not just the battlefield.
You will be able to exile a skeletal changeling from your graveyard to pay for the ability on Scarblade elite.
Just as a terminology note the costs of abilities (everything before the ':') never target in MTG.
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Example skeletal changeling being targeted from scarblade elite is valid?
EDH: RWB Edgar Markov The current updated decklist is here
EDH: WUB Oloro, Ageless ascetic The current updated decklist is here
EDH: UWG Phelddagrif, The current updated decklist is here
EDH: WUB Yennett, Cryptic Sovereign The current updated decklist is here
EDH: WUB Alela, Artful provocateur The current updated decklist is here
EDH: GB Hapatra, vizier of poisons The current updated decklist is here
Note, that you don't target the card you exile with Scarblade Elite, only the creature to destroy with the ability.
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You will be able to exile a skeletal changeling from your graveyard to pay for the ability on Scarblade elite.
Just as a terminology note the costs of abilities (everything before the ':') never target in MTG.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
The Crafters' Rules Guru