Expensive Negate that lets you steal it for later if you cast another noncreature spell. Since I imagine that Sequence cards and counterspells won't mix too often in limited, in addition to only countering noncreatures, I figure it should be okay at .

Grammar kinds makes this wording ambiguous. It sounds like this modifies what happens if you cast a further spell in the future rather than modifying this spells effect if you cast a spell beforehand.

That's problematic if the effect still makes sense. Best/most simple fix is probably to replace "that spell" with "the targeted spell".

Should this spell read "Counter target spell if it's a non-creature spell"? That would help reduce the targeting restriction problem, but I'm not sure if that's supposed to be part of the point. Either way, a lot of new players won't understand that they need a target to cast this spell.

I don't think it should, jmg. It's a rare, so that's not a point of confusion you need to worry about, but also your phrasing implies that there's some trick to casting it that's not actually present.

I see what you mean, Secret. Wording is updated.