Bag of Three Gems

This magic item is found in treasure troves that are hundreds of years old. Three gems lie within the bag. On the outside of the bag there is three words: ghost, come, and and view. To use a gem they must say the gems name to the gem. The white one is ghost it will make them invisible. The red gem is come, they can summon any item they can physically see (doesn't work on living things, but it does work on corpses). The blue gem is view, they can see though up to 40 feet of any material. Ghost and view's effects last for 1 minute. After they have used any of the gems 3 times they gain a level of exhaustion. 

Notes: Summoning, Exploration