Does shroud prevent a player from targeting their own creature with their own spells?

Shroud is a static ability defined in CR 702.18a: "Shroud means 'This permanent or player can't be the target of spells or abilities.'" The rule makes no exception for the controller or owner of the permanent — it applies universally to every player, including the one who controls the shrouded creature.

This is the key distinction between shroud and hexproof (CR 702.11a). Hexproof only prevents opponents from targeting the permanent, leaving the controller free to target it with their own spells and abilities. Shroud offers no such loophole — it is a complete targeting ban from all sources.

Targeting is defined in CR 114.1: a spell or ability targets something only if it uses the word 'target' in its text (or is defined as targeting by a rule). If a creature has shroud, it cannot legally be chosen as a target for any such spell or ability, regardless of who controls it.

Concrete example: You control a creature with shroud, like a Gladecover Scout enchanted in a way that grants shroud. You want to cast Giant Growth ("Target creature gets +3/+3") on it. You cannot — even though you control both the spell and the creature, shroud makes your own creature an illegal target for Giant Growth.

If you want a permanent that protects against opponents but still allows your own targeting, look for hexproof instead of shroud. They look similar but behave very differently in practice.