Construct Protective

Whenever a commander creature enters play
under your control, you may have Construct
Protective become an Aura and attach it to that
creature.
If Construct Protective is an Aura, it has
'Enchant creature', 'Enchanted creature has
hexproof', and 'If enchanted creature leaves play,
return Construct Protective to the battlefield
under your control, it is no longer an Aura'.