Do X costs count as 0 CMC or the amount of mana you pay for them?
Example
Play {Chimeric Mass} for {6} mana
On the stack would it be considered a spell of 0 CMC or 6 CMC? Also, it's CMC would retain when it hits the field correct?
Curious for cards such as {Spell Blast} or {Abrupt Decay}
Anywhere but on the stack spells with X are 0, while it is on the stack the CMC is equal to what X has been declared to be.
202.3b (http://imtgapp.com/forum/index.php?action=imtg;area=rule;number=202.3b): When calculating the converted mana cost of an object with an {X} in its mana cost, X is treated as 0 while the object is not on the stack, and X is treated as the number chosen for it while the object is on the stack.