For Challenge # 147. I was expecting any card to include "Repeat this process" to have a lot of words. But after thinking about Mana Clash for a couple of seconds, this idea just popped out at me. It seemed cool, even if it took time to resolve.

I kind of wish I could make the card mono-colored black... but I wasn't really sure about all this randomness in Black. Philosophically, it sounds fine to do it on occasion, but I don't think Wizards ever has. Equally, this seems okay in mono-Red what with Scar and all... but I'm sure that would get some complaints too. Ah well.

I like the flavour of the randomness, but it might take a long time to execute. Would mono-black "Put a -1/-1 counter on each creature. Repeat until..." work?

I suppose it would. I just like the idea of the amount of chaos this card could add to the game. I thought about making the card Mythic, though, since you really don't want to see this event happen too often. And given the right game group, it wouldn't take that long to resolve. But given the wrong game group? Yeah... pretty painful.

For what it's worth, though, I'd be rather happy to see your version in print, Jack. I'd play it.