It depends on what the specific card is and how the ability setting its power works. For example:
Lord of Extinction constantly updates its P/T wherever it is. If it's in the graveyard, the value of * will be the current number of cards in all graveyards (including itself)
Sewer Nemesis depends on a player chosen as it enters the battlefield. If it's in the graveyard, that "chosen player" will be undefined and the value of * will default to zero
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Rhadamanthus says... Accepted answer #1
It depends on what the specific card is and how the ability setting its power works. For example:
January 13, 2022 12:15 p.m.