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Some spells or abilities that produce mana restrict how that mana can be spent, have an additional effect that affects the spell or ability that mana is spent on, or create a delayed triggered ability (see rule 603.7a) that triggers when that mana is spent. This doesn’t affect the mana’s type.

An Incubator token is a double-faced token. Its front face is a colorless Incubator artifact with “{2}: Transform this token.” Its back face is a 0/0 colorless Phyrexian artifact creature named Phyrexian Token.

If a player wants to choose the name of the back face of a double-faced card, the player may do so. (See rule 712.) If a player is instructed to choose a card name with certain characteristics, use only the characteristics of the back face to determine if this name can be chosen.

The mana value of an object with no mana cost is 0, unless that object is the back face of a nonmodal double-faced permanent or spell, or it is a melded permanent.

The mana value of the back face of a nonmodal double-faced permanent or spell’s back face is calculated as though it had the mana cost of its front face. If a permanent or spell is a copy of the back face of a nonmodal double-faced object (even if the card representing that copy is itself a double-faced card), the mana value of the copy is 0.

An ability printed on either face of a nonmodal double-faced object (see rule 712) is considered to be “printed on” that object for these purposes, regardless of which face is up.

A double-faced permanent receives a new timestamp each time it transforms or converts.

A replacement effect doesn’t invoke itself repeatedly; it gets only one opportunity to affect an event or any modified events that may replace that event.

If a card in a graveyard has {X} in its mana cost, X is considered to be 0.

To double a player's life total, that player gains as much life as needed so that their life total is twice the number it was before. If their life total was negative, that player loses as much life as needed so that their life total is twice as far below 0 as it was before. Other effects interact with this life gain or loss accordingly.

If an effect allows you to cast a spell with certain characteristics, consider only the characteristics of the half you're casting. For example, if an effect allows you to cast a sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Assault this way, but not Battery.

A split card's characteristics are a combination of its two halves while it is not on the stack. For example, Assault // Battery has a mana value of 5 while it is in your library. If an effect allows you to search your library for a card with mana value 4 or less, you can't find Assault // Battery.

Each split card has two names. If an effect instructs you to choose a card name, you may choose one of those names, but not both.

Each split card is a single card. For example, if you discard a split card, you've discarded one card, not two. If an effect counts the number of sorcery cards in your graveyard, Assault // Battery counts once, not twice.

Split cards have two card faces on a single card. The characteristics of the half you didn't cast are ignored while the spell is on the stack.

To cast a split card, choose one of its halves to cast. There's no way to cast both halves of this split card.

If you copy a spell that's half of a split card, the copy copies that same half. For example, if you copy Assault, the copy is also Assault, not Battery.