you're obviously clueless , he has the same health at 0 magic OR 140 magic , hence why he's awful , he has the same defense in his summoned form at 0 defense OR at 60 , same might at 0 OR at 40
same for his siege damage , it's the same whether he's naked, no items and no cards or full flawless divines
This is not true his damage output while Imprisoned Spirit is active is strongly modified by magic, you can easily test it by attacking empty walls and looking at the post battle analysis. I did that, tested him at 0 magic and 30ish magic with a 4/4 ult and the damage output was 550K vs 1200K (rough numbers, don't remember the exact values), which means a ~4% scaling per point of magic.
Also the nerf never hit live, so there is no reason for a refund and i wouldn't recommend him as a tank, his damage output is remarkable though.