If the creature you control is an illegal target as Bridgeworks Battle tries to resolve, no creature gets +2/+2. If that creature is a legal target but the creature you don't control isn't, the creature you control still gets +2/+2.
Bridgeworks Battle // Tanglespan Bridgeworks
If you choose two target creatures and either target is an illegal target as Bridgeworks Battle tries to resolve, neither creature will deal or be dealt damage.
The mana value of a modal double-faced card is based on the characteristics of the face that's being considered. On the stack or the battlefield, consider whichever face is up. In all other zones, consider only the front face. This is different than how the mana value of a transforming double-faced card is determined.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Ron Spears
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