I wanted to play the big worm from teh campaign and the dwarf that call him. So I made a tunneling deck.
I try the Arena just to see how it works and I just finish it !! I didnt expect that. I went 13-2

Here a link to the youtube video I post. I don't have a micro yet so there is no sound .I have order one, when it come I will edit the video
youtu.be/2u-A8udY3fU

Here the list for the one who don't like Youtube :

Main deck with Tunneling and extra turn

4 Wormoid Hydra
4 Worm Caller
4 Reese the Crustcrawler
4 Mastery of Time
4 Excavation Bot
4 Fissuresmith

For survive the early game

4 Burn
4 Transmogrifade
4 Arcane Focus AA

Shards

4 Crackling Vortex
4 Well of Innovation
4 Remnant of Innovation
4 Brewed Ambrosia
4 Ruby Ice
4 Sapphire Ice

Maybe 4 Reese is too much since he is Unique.