OK, here are some questions that doesn't involve Theros for once!
I have some questions about planeswalkers.
Indestructible Planeswalkers: How do they work?
Indestructibility can be cast on any permanent, making it indestructible. What does this mean practically, though?
2 key questions:
If an opponent attacks my planeswalker and damage gets through, does my planeswalker lose loyalty counters due to that?
Does having 0 loyalty counters on my planeswalker cause it to be put into the graveyard? (I'm thinking it would be similar to a 0-toughness indestructible creature.)
If both of these are true, then casting Indestructibility on a planeswalker would probably be a stupid idea, and would only protect against things like Dreadbore.
This search also got me searching for other Auras that could enchant planeswalkers. Most are straight-forward, but 2 other ones raise questions, too.
Faith's Fetters: I'm assuming that planeswalkers' abilities are considered "activated abilities" and thus, can't be used, since "Enchanted permanent's activated abilities can't be activated unless they're mana abilities."
Psychic Overload: This taps the permanent and it doesn't untap normally. Can a tapped planeswalker's loyalty abilities be used? Can the opponent attack a tapped planeswalker?
Finally, a question about Gideon and Cipher: Do the ciphered cards stay ciphered after Gideon turns back into a regular planeswalker, and thus, continue to be used if and when he becomes a creature again? (I'm assuming this is the case, and it's similar to the keyrunes, where the cipher sticks, even when it becomes just a regular artifact again.)