Xeno'jiiva, Creator of Dragons

Flying
Element: Fire, Dragon
When Xeno'jiiva comes into play, destroy all
non-Elder Dragons.
Xeno'jiiva comes into play with X +1/+1 marks.
Remove a +1/+1 marker from Xeno'jiiva at the
beginning of each of your upkeeps. If there are
no +1/+1 counters on Xeno'jiiva, sacrifice it.