Hexproof is a static ability that means that the affected permanent or player cannot be the target of spells or abilities your opponents control, but can still be target by spells or abilities you control.
Hexproof is very similar to the keyword shroud, except that shroud additionally prevents the permanent's controller from targeting the permanent.
Abby controls a Gladecover Scout and both players have a Shock in hand. Despite the fact that both players have the same card, only Abby can target the Scout with her Shock as it cannot be targeted by her opponents.
- 702.11a. Hexproof is a static ability.
- 702.11b. "Hexproof" on a permanent means "This permanent can't be the target of spells or abilities your opponents control."
- 702.11c. "Hexproof" on a player means "You can't be the target of spells or abilities your opponents control."
- 702.11d. Multiple instances of hexproof on the same permanent or player are redundant.