Apologies if this is already considered somewhere else: there are a lot of ideas to look through!
I was thinking that there should be some potential weakness for protected permanents. For example, immortal creatures can still be killed by damaging shields. They aren't 100% invulnerable to everything. So neither should enchanted artifacts.
Obviously, you can't have a card that can actually target untargettable permanents, so as with immortal creatures it would have to be something with a wider effect. Anything that affects all permanents would be too powerful so it would have to be random, I reckon. Here are some ideas off the top of my head:
- Creature skill (active): Destroy one random permanent. Would suit entropy (maybe earth creature with entropy skill cost?)
- Creature skill (passive): Random permanent/2 random permanents is/are destroyed if this creatures takes damage/dies. Again, suits entropy.
- Permanent: One random permanent is destroyed at the end of each turn.
- Spell: Two random permanents are destroyed.
Other musings: Could be too powerful against pillarless decks? But then against normal decks, potentially less useful than Butterfly Effect. Suits Entropy but Entropy already has BE. If a spell, maybe something which targets both players, like Pandemonium, if unupped?
Oh well. I thought it was an interesting concept, but don't have much experience in card designing.
Any thoughts?