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If an ability would produce one or more mana of an undefined type, it produces no mana instead.

Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.

To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”

An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.

The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

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.

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.

Playtest cards use a modified version of game symbols, such as {T} and {W}. These modified symbols should be treated as the standard symbols during play.

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.

If your library has only one card in it when Blurry Visionary’s ability resolves, it won’t make that card a modal double-faced card, but you will put it into your hand.

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).

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.

More complicated scenarios involving two different double-faced cards or multiple Blurry Visionary triggers affecting the same card over and over will be left as an exercise for the reader.

Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).

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.

A modal double-faced card can’t be transformed or be put onto the battlefield transformed (even if one of its faces was formerly part of a transforming double-faced card). Ignore any instruction to transform a modal double-faced card or to put one onto the battlefield transformed.

If an effect allows you to play a land or cast a spell from among a group of cards, you may play or cast a modal double-faced card with any face that fits the criteria of that effect.

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.