As the title says - in the sprite section, there's the Invisible Sprite Killer Box v1.1
or alternatively this update
by spooonsss I'm using and of course it's supposed to kill all sprites it comes into contact with.
I'd love to have a version of this sprite which let you specify which exact sprite to kill if this is reasonable.
(I noticed there's also a custom block which does something close (reversed) but unlike the Sprite Killer Box-sprite it doesn't kill the sprite I want to kill, which would be sprite 7D, the p-balloon.)
Edit: I almost forgot: it would be supercool if there's a check for custom sprites in there as well when you specify the sprite, since I'm using the disassembly from the custom sprites section.)
scrap that, somehow that is glitchy.