To determine whether it is legal to play a modal double-faced card, consider only the characteristics of the face you're playing and ignore the other face's characteristics.
Esika, God of the Tree // The Prismatic Bridge
The mana value of a modal double-faced card is based on the characteristics of the face that's being considered. On the stack and 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.
While resolving the triggered ability of The Prismatic Bridge, if there are no creature or planeswalker cards in your library, you'll simply reveal your entire library, randomize it, and continue playing.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Johannes Voss
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