Neither Urza nor Mishra would admit it, but it was their similarities, rather than their differences, that drove their obsessive rivalry.

Parallel Lives

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.

"Brave Syr Armont mused: Was the elves' true nature that of day's civility or night's savagery? Could such bestial rage be bestowed by curse alone?"
—*Curse of the Werefox*

Wilds of Eldraine: Enchanting Tales

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Jumpstart: Historic Horizons

Everything that is specified by the effect creating the original token or tokens will also be true about the additional token or tokens created by Parallel Lives's replacement effect. For example, if an effect tells you to create a token "tapped and attacking," the additional tokens will also be tapped and attacking.

If you control two Parallel Lives, then the number of tokens created is four times the original number. If you control three, then the number of tokens created is eight times the original number, and so on.