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Does Tartaros include demons discarded from hand, or is it similar to the newer Protection of Jerusalem in that the demon must have been in play or set-aside? Additionally, is Tartaros like the new PoJ in that the holder of Tartaros must be the one causing the discard (and not discarded by numbers or an opponent's SA)?
I am not so sure that the card that was in play first takes precedence. I have seen it played where the player gets to choose which ability they want to use since they were activated simultaneously. Actually not with wandering spirit but when Gates of Hell discards a demon.
2. From the literal reading of the card, at any time that it holds no EC, you must place one there face-down. The rule has been well-established that fortresses are constantly reactivating, and do not activate once per turn/phase. Therefore, if it is ever empty (regardless of when), you must occupy it. This includes even after the EC there is used to block.Note also that when this is extended to address the rules about not having a card type in hand when an ability requires it, you must reveal your hand if you cannot place an EC in order to prove it.I have never seen it ruled this way, but that is the correct ruling by the wording on the card and the rules around the ability, barring an errata...hrm...
But can it be used to band an EC into battle after the rescuer has been blocked and has removed the EC from battle (so that it is now unblocked again), or does "unblocked" mean just before the first time the rescuer is blocked?