mtg put card from hand on top of library

mtg put card from hand on top of library Opened this at FNM the other night, could somebody please explain how it works for me? TIA! : r/mtg can someone please explain this

Name: mtg put card from hand on top of library Opened this at FNM the other night, could somebody please explain how it works for me? TIA! : r/mtg can someone please explain this
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Description

5: Put target creature card from a graveyard onto the battlefield under your control

Remember that you need to reveal both copies of the card to all players

While Magic: The Gatherings standard deck construction rules typically limit a deck to four copies of any one card with the same name, the Nazgl cards feature a written exception in their rules text allowing all nine to be included in the same deck