Made by Zack Zittnan.

Huh.

Feels like a kind of interesting little game, where your opponent needs to be at least as efficient as you. And then you read the "on your turn" and realise people would actually just combo it with Clockspinning for a perfect lock-down.

Take that 'on your turn' out, and you at least need to start using Power Conduit. But, uh, Power Conduit does actually, you know, exist?

So honestly, I'd suggest balancing this by taking out the "on your turn" and the "but one" bits (so if you cast nothing it sits at zero) and letting them cast one more spell than this has counters.

Same effect if you're not abusing it; and if you do abuse it, they can at least cast one spell a turn. (Such abuse is still useful, of course - lets you cast a spell and still they can only cast one)

Oh - my reasoning for removing the 'on your turn' bit - if left in, then you just end up with a "Ok, so I cast everything during your turn" deck. Which seems a bit of a boring place to always end up, given such an otherwise interesting idea for an effect. There are already too many "Draw, Go" decks out there.

Simple fix to that: turn "all but one" into "all", and have the last ability be "X is one plus the number of charge counters on ~".

Edit: Wait... Sorry, I hadn't realised V actually suggested that too (in the middle of his comment).