Created for Challenge # 026.

I considered weaker versions (protection from everything forever is a bit much), but decided to write the coolest version.

More sensible alternatives might be to limit this to attacking creatures, or give creatures protection from everything except combat damage so at least you don't have an eternal blocker, or make this just last one turn.

Mmmm... yeah, needs some other way to get rid of it, otherwise you just sit behind an army of utterly invulnerable blockers and sneak through a few utterly unblockable attacks and win in a slow and boring way.

V: I don't know. Any landwalk, unblockability, or if you're unlucky just a simple flyer could pop the bubble.

How about "When you're dealt damage, abandon this scheme at end of turn"?

cmeister2: Ah, good idea. I'd discarded the idea of "any damage" because it was possible to turn it off instantly, but at end of turn means you still get good use out of it.