mtg put card from hand on top of library

mtg put card from hand 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 Surging Aether [Coldsnap]

Name: mtg put card from hand 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 Surging Aether [Coldsnap]
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Description

And speaking of Sol Ring, you can tutor it with this card, too

For example, in the case of this card (It Means No Worries), despite it being designated as a Rare, the standard version of the card isnt likely to cost more than $1

Dawn of Hope's first ability triggers just once for each life-gaining event, whether it's 2 life from Werefox Bodyguard or 3 life from a Food token

In the upcoming set The Lord of the Rings: Tales of Middle-earth , players have the chance to join the Fellowship in adventures filled with valor, courage, and second breakfast