Hexproof means the creature can't be the target of spells or abilities your opponents control. It places no restriction on what you can target with your own spells and abilities.
So if you control a creature with hexproof, you can freely target it with your own auras, pump spells, removal, or any other spell or ability you control.
This is a common point of confusion because shroud (an older keyword) prevented all players, including the controller, from targeting the creature. Hexproof was designed specifically to fix that feel-bad situation.
Unofficial fan resource — not affiliated with or endorsed by Wizards of the Coast. Answers are AI-generated estimates grounded in the Comprehensive Rules and are not a substitute for an official judge. Verify anything match-critical.