Digging/Burrowing Champion

There are currently no game mechanics that go underground, the only one that I know of is Cho'gath's rupture. There isn't a single one where the champion can hide underground or dig to get through a wall. I'm not going to think up an entire champions concept for 2 reasons.

1. There are many possibilities for a champion like this ex. A Yordle with a Drill, A Serpent that moves through the ground as a walking animation, something undead from the shadow isles that could get underground or have other corpses rise from the ground.
2. None of them even get read by anyone and just get downvoted.

I would just like to see the Champion Design team to utilize all possible game mechanics.