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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.

Exponential Growth doubles a creature’s power sequentially, not all at the same time. For example, if X is 3 and you target a 2/2 creature, you will double its power once to 4, again to 8, and a third time to 16, making it a 16/2 creature until end of turn.

If a creature’s power is less than 0 when it’s doubled, instead that creature gets -X/-0, where X is how much less than 0 its power is. For example, if an effect has given a 5/5 creature -7/-0 so that it’s a -2/5 creature, doubling its power makes it a -4/5 creature.

If an effect instructs you to “double” a creature’s power, that creature gets +X/+0, where X is its power as that effect begins to apply. (This is not the value of X you chose when you cast the spell)