Self-Assembler won't let you choose Argivian Avenger (Shapeshifter) as a valid search target for an Assembly-Worker
Self-Assembler has the Enter the Battlefield effect: you may search your library for an Assembly-Worker creature card, reveal it, and put it into your hand. However, when searching your library, you can't choose the Brothers War creature Argivian Avenger, which has the creature type "Shapeshifter" - ie, all Creature Types, including Assembly-Worker.
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Duskheart#64893
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[Deleted User] commented
Argivian Avenger is a Shapeshifter but it does not have Changeling