Equipped creature has lifelink. As long as you have 30 or more life, equipped creature gets +5/+5 and has indestructible and "Prevent all damage that would be dealt to this creature." Equip
原文If the equipped creature is dealt damage at the same time that you gain life (most likely because it dealt combat damage to a creature blocking or blocked by it) and your life total becomes 30 or greater as a result, the damage won’t be prevented. However, the equipped creature will have indestructible before state-based actions are checked, so it won’t be destroyed even if that damage would ordinarily be lethal.