What happens in an Archenemy game if a non-ongoing scheme card is face up in the command zone?

In an Archenemy game, when a non-ongoing scheme card is face up in the command zone, it is indeed turned face down and placed on the bottom of the owner's scheme deck. This reflects the specific rules governing Archenemy gameplay, which involves the use of scheme cards to add unique and thematic elements to the game.

Non-ongoing scheme cards represent one-time effects rather than persistent changes to the game state, so once the effect has been carried out according to the card’s instructions, the card no longer serves a purpose in its active form. Turning it face down and placing it on the bottom of the scheme deck effectively removes it from play while also maintaining the integrity of the scheme deck for future card draws. This ensures that the game continues to flow smoothly while adhering to the mechanics of scheme card play.

The other options do not accurately describe the outcome of a non-ongoing scheme card being face up in the command zone within the context of an Archenemy game. For example, while ongoing schemes may remain active for a consistent duration, non-ongoing schemes specifically do not operate in the same way, which aligns with the correct understanding of this game's mechanics.