Creepy thing on Minecraft!!

Hey guys.

There is this really creepy black-tall Creeper looking thing that I have no idea what it is.

All I know is-

1. It's black and tall
2. It's holds a block of land (Sand, dirt, etc.)
3. It killed me once.
4. And I think it throws flowers.

I have proof that it exists!- 

It's dark because I had to pause the game to be able to use the "Snipping Tool"

So there you have it.

I showed it to Roxy and she was like: "WTH IS THT?????????????"
She really said that.
I replied: "IDK!!!!"

XD

But anyway, I have no idea what it is, maybe it like rebuilds the land, has something to do with the Creepers' death, I don't know.

Bye!
~Violet