Can you redirect a spell targeting you to a permanent you control with a redirect effect?

Redirect effects (such as those on cards like Deflection or Shunt) allow a player to change the target of a spell to a new legal target. The key rule is CR 115.7: a target must be legal at the time the targeting effect resolves, meaning the new target must satisfy all targeting requirements of the original spell.

If a spell says 'target player,' it can only target players — not permanents. So you could not redirect such a spell to a creature or artifact you control, because permanents are not players. However, some spells target 'any target' (meaning a player, planeswalker, or creature), in which case redirecting to an eligible permanent you control is perfectly legal.

Additionally, the redirect effect itself must be used at the right time: typically on the stack after the spell is cast, and the permanent chosen must be a valid target (e.g., not hexproof, not an illegal type). See CR 115.7 and CR 608.2b for legality checks when targets are changed.

Concrete example: Your opponent casts Lightning Bolt targeting you. Lightning Bolt says 'any target,' so you activate Shunt to redirect it. You choose your own Stuffy Doll as the new target — this is legal because Stuffy Doll is a creature, which qualifies as 'any target.' The Bolt now deals 3 damage to Stuffy Doll instead of you.

But if the spell said 'target player,' no permanent — even one you control — could be chosen as the new target, because permanents are not players (CR 109.4, 115.7).