Cool art. Okay stats, but good HP. Sentinel is always pretty nice to have. Now his ability. You can pay all 4 for him, pay 2 and discard 2 from your deck, or pay 0 discard 4. He is a reliable defender that you can bring in turn 1 to defend, and buy time before you can get permanent defensive solution. Or keep him as a main defender.
Early game: 9/10
Late game: 5/10