Choose wisely!

Either 2 and 3 or 3 and 7.

Free gravel is fantastic, a ton of practical things to be done with it and is otherwise expensive.

Teleporting 7 inches away is enough to get you past many barriers and walls, that's not insignificant. This seems the coolest to me.

Being able to determine if a container is empty or not seems pretty cool as well although I can't think of a good example of how this would be useful.

The rest are hilarious.