Interesting article but could you please detail more why flash is restricted? I really have no idea why, it doesn't look that great at first glance.
Sol ring isn't restricted by the way, perhaps you're referring to legacy but in classic mtgo, you can have x4. I'd also like to know how you can abuse channel, to me it looks like you need many lands for that to work.
I'm not sure I agree on balance, it's effectively an armageddon, wrath of god, and any black mass discard card put together for 2 lousy mana. If you're running blue/white control with low cost counterspells then you're put in a nasty advantage. To me it's a card of last resorts, like a panic button, I think it should stay restricted. It can really slow down a 2hg game by starting over from scratch. I'm thinking about using ignorant bliss and balance. That way I get to keep my entire hand plus draw a card and everyone else discards their entire hand.
Wheel of fortune is an amazing card which unfortunately is restricted because of abuse with black discard cards like megrim or liliana's caress. Windfall is a decent alternative though.