why some players using items that deal magic damage to champions that don't deal any of it.

For example: some players use Guinsoo's Rageblade on vayne i know that it will apply an additional time for every third basic attack through it's passive (silver bolts) but Guinsoo's Rageblade passive makes Basic attacks deal 15 bonus magic damage on-hit. Same with master yi some people use Guinsoo's Rageblade and Wit's End but their passive makes Basic attacks deal bonus magic damage on-hit. ( I know that all basic attack / auto attack deals physical damage and some of them scales by magic damage but i am confused xD) So.. pls can anyone explain what's going on and thank you.
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