Insectile Aberration

[(nameless one)]

Whats its converted mana cost? Is it 1 (Delver of Secrets) or 0?

[Mon,Goblin Chief]

It's 0 - flipped cards, like just about everything else, have the converted manacost of what you can see in the upper right hand corner of the card (exceptions: clones because they copy stuff and thereby change their manacost to a new value, future shifted cards -upper left hand - and split cards - both "upper right hand" corners). No mana-symbols means cmc = 0.

[preddi]

If its mana cost is 0, is it still a blue permanent?

[Windux]

Flip-Cards do have "dots" in front of their "Creature/Enchantment/etc"-line. This defines the color.

Insectile Aberration do have a blue "dot"

[cdr]

You may want to take a look at the rules for double-faced cards (http://yawgatog.com/resources/magic-rules/#R711).

The back side of double-faced cards have a color indicator to the left of the type line that defines their color. Insectile Aberration's indicator is blue.