I'd like to have a block that I can edit once, and then have the change propagate across all emails that use the block.

Here's my use case: This block will contain a list of upcoming events, which I can update as the events change.

I can then add this block to my evergreen emails, which I write once, and never need to touch again.

And what would be even more cool, is if this variable block has conditional logic to it, so we can show different things, depending on the presence (or no presence) of tags.