If a permanent has {X} in its mana cost, X is considered to be 0.
20-09-2016
wotc
To determine how many cards to draw, use the mana value of the permanent immediately before you sacrificed it.
20-09-2016
wotc
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.