This Item Changed Terraria Rarity

Don’t forget the friendly boulder, though I think it might be less rarer than the dirtiest block

I found it like
Immediately
In my first world since the new update

you can easily find one in a skyblock world, have a dirt block in your inventory, and start mining the dirt, if you didnt pick one up, then you found it

In 1.4.5 the skyblock seed makes it easy to get

I got one in the first 5 minutes of play time