I kindly ask your support to understand this scenario: I target an opponent’s creature with Proteus staff, and the third revealed card is a creature, that enters the battlefield under my opponent’s control. Do I get to know in which order the other two revealed cards are put on the bottom of the opponent’s library, so that I can cast Tunnel vision without guessing? Thanks very much in advance!
No; when cards are put on the bottom of a library with Proteus Staff, "[t]hat library's owner doesn't reveal the order in which the cards go into the library" (C.R. 401.4).
Proteus Staff and Tunnel Vision