This idea is pretty strange, well not exactly the idea to be fair. It's the block. You'll see them very rarely but if you do, they'll most likely to be grouped together with other 'Ever-Changing Blocks'. Now, these blocks change after 5 second, they could be dirt the first and platinum the next, they always change randomly to a new block so when you're mining some copper and you seem to be start mining a block that sets you on fire, blame this block. Personally it would be pretty cool and if there were such a thing to make the item change to a few limited items, selected by the player, and have it keep going, this would act well for maps.
A water spawning block? That's most unlikely. For an exploding block, that's most unlucky, unless you have some strong gear, there is no need to worry and as a plus, the randomness of block changing will be super duper random so there's not really any chance you'll encounter a problem like this, regardless of what you're wearing. Thank you for the feedback.
Water spawning blocks are blocks only admins can spawn, they cannot be destroyed. Tiy spawned one in his sand livestream
If this were ever implemented, the modder or developer would make it not in the block, I'd give them details. Oh and by the way it was only a brief idea so I didn't actually expect anyone to like it. You have a reason why you don't?
Exactly. It would ruin the adventure aspect of the game. You don't need to go searching for this rare ore anymore, just wait for it to change.