My first two paragraphs state why those two balance changes would be terrible for the card. Each paragraph addresses one of your balance suggestions. In the second paragraph what I mean is that 2 5/5’s for 3 is good value, but when the mana cost goes up the value becomes pretty poor, making the awesome BBS not worth it, and therefore making Variax a bad card.
As far as wincon, Variax IS a timekeeper for the match if that’s the kind of deck you’re playing against. Variax’s inherent infinite value makes it a timekeeper, there’s no other way to go about it. But the clock you’re on allows you enough time to play any other win condition in the game, which is why Variax putting you on the clock is manageable. No deck should be so slow that you aim to win the game on turn 15+. I’ve played that slow control meta. It’s not fun.
.’ This is my big beef with the card.