Blurry Visionary

If an effect allows you to put a card with particular characteristics onto the battlefield without instructing you to play or cast it, consider only the characteristics of a modal double-faced card’s front face to see if that card qualifies. If it does, it enters the battlefield with its front face up.

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 from how the mana value of a transforming double-faced card is determined.

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

And if that’s not complicated enough, similarly, if one of the top two cards of your library is a transforming double-faced card, you put it into the new sleeve with either face of the card facing outward, and it still becomes a modal double-faced card at the end. So, for example, if your top two cards are Brainstorm and the transforming double-faced card Delver of Secrets // Insectile Aberration, you will end up with a modal double-faced card in one of the following permutations: Brainstorm // Delver of Secrets, Brainstorm // Insectile Aberration, Delver of Secrets // Brainstorm, Insectile Aberration // Brainstorm. Note, however, that Insectile Aberration, like most back faces of transforming double-faced cards, has no mana cost, so it is normally not possible to play that card from your hand.

Once Blurry Visionary’s ability finishes resolving, you can’t change which face of the new modal double-faced card is the front face. It stays that way for the rest of the game.

If one of the top two cards of your library is already a double-faced card, put it into the new sleeve with either of its two faces facing outward. Only the outward face will be part of the new modal double-faced card, while the inward one ceases to exist for the rest of the game. For example, if the top two cards of your library are Brainstorm and the modal double-faced card Valki, God of Lies // Tibalt, Cosmic Imposter, you will end up with a modal double-faced card that has Brainstorm as one of its faces, and either Valki, God of Lies or Tibalt, Cosmic Imposter as the other face, with either face as the front (your choice).