Card text
No reference price for this printing yet: not enough stores to make an average.
Run a comparison: we query the stores live, it may have arrived this morning.
Official rulings
2 rulings · in English, source ScryfallIf 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. Toughness is doubled similarly.
2018-07-13 · Wizards of the CoastIf 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 Nylea’s Colossus -8/-0 so that it’s a -2/6 creature, doubling its power and toughness gives it -2/+6, and it will become a -4/12 until end of turn.
2018-07-13 · Wizards of the CoastAll printings