mtg play with top card revealed

mtg play with top card revealed can someone please explain this to me? I'm not understanding where it says that the target opponent reveals the card of my library. : r/mtg A permantent way to play

Name: mtg play with top card revealed can someone please explain this to me? I'm not understanding where it says that the target opponent reveals the card of my library. : r/mtg A permantent way to play
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Description

1 Zur, Eternal Schemer

As long as your devotion to red is less than five, Purphoros isn't a creature

#6 The Rollercrusher Ride Fresh from Duskmourn is The Rollercrusher Ride

Either way is a good way to choose your commander and the choice is up to you

The goal is to spread small amounts of damage around on your opponent's side of the board and take advantage of characters that become more powerful when the opponent has damaged characters in play