原文If a permanent has in its mana cost, X is considered to be 0.
2016/09/20
原文To determine how many cards to draw, use the mana value of the permanent immediately before you sacrificed it.
2016/09/20
原文If an effect copies Morbid Curiosity, the controller of the copy will draw the same number of cards as determined by the original. Its controller can't and doesn't have to sacrifice a permanent.