Canada

There's nothing to scrap, Capital gains taxes are already already waived for selling your primary residence in Canada.

My preference would be a policy that taxes all properties (just the land, not the building) and then refunding that money to every Canadian citizen (and maybe people who are on a PR track working towards citizenship) equally. That way if you have a big property with a high land value, and only 2 people living there, you're not getting most of your tax back, but if you've got 3 kids and 2 adults in a 5 bedroom house in a suburb, or the same in a townhouse closer to the core, you're breaking even, and if you choose to live as a couple in a 1 bedroom apartment (low land value per unit) or a larger place but further out of town where property is cheaper, you may even get a little bit of extra money back each month.

That way people are paying everyone else for the amount of desirable land they want to consume. You want a mansion in downtown Vancouver, go right ahead, pay everyone else for that privledge. You don't need as much and are happy to have a small apartment just outside the core? Thank you for your sacrifice, here's some cash from Mr. Mansion.

This scales nicely and encourages people to only use what they need at a given time, and also encourages development of density of properties that have high land values because people want to live there.

It also directly taxes non-citizens who want to own land here. Paying every Canadian for the fact that they're consuming land in Canada.