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Austere Command does not respect 711.4b and treats the converted mana cost of the back side of double-faced permanents as 0. #258
To make it complete
711.4b While a double-faced permanent’s back face is up, it has only the characteristics of its back face. However, its converted mana cost is calculated using the mana cost of its front face. If a permanent is copying the back face of a double-faced card (even if the card representing that copy is itself a double-faced card), the converted mana cost of that permanent is 0.