mtg put card on top of library

mtg put card on top of library can someone please explain this to me? I'm not understanding where it says that the target opponent reveals the card my library. : r/mtg Can someone explain this card?

Name: mtg put card on top of library can someone please explain this to me? I'm not understanding where it says that the target opponent reveals the card my library. : r/mtg Can someone explain this card?
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SKU: 61428375671
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SKU: 61428375671

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Description

Heres a side view of a regular, non-foil Magic card, just for fun: When it comes to the size of digital MTG cards in pixels, it can vary

This makes it more of a dexterity check than one of skill or even luck, and since not everyone can actually flip a card from one foot, it was banned from Vintage