# Do you pay one or two mana to bounce a transformed Delver of Secrets with Repeal?

Do you pay one or two mana to bounce a transformed Delver of Secrets with Repeal? In total I mean, does x have to be equal to 1 or 0?

Two mana; for the converted mana cost (CMC) of a transformed card, you have to look at the untransformed side:

711.4b While a double-faced permanentâ€™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.

Since Delver of Secrets' converted mana cost is 1, X = 1 and you'll have to pay 2 mana to Repeal it.

Insectile Aberration's side doesn't show a mana cost, and while for some cards that means they have converted mana cost 0, not so for double-faced cards

202.3a The converted mana cost of an object with no mana cost is 0, unless that object is the back face of a double-faced permanent or is a melded permanent.