>>96743922
Just noticed that Toss is just fling with a different name. It's supposed to be based on toughness!

>>96744627
Making the discard symmetrical would probably probably go a long way. I'd also consider doing something like Torment of Hailfire where you can distribute the damage across multiple vectors rather than exclusively targeting the hand. That way it's more about general attrition and less about keeping everyone from playing spells, which seems more in the spirit of commander. (although maybe your groups is into that experience)
>bounce
Don't mind it, but seems at odds with the idea of playing with the commander tax.
If you want to justify Sultai, you could also do something like the Brother's war mana sink dudes where the color of mana matters rather than just the ammount.