Flash (You may cast this spell any time you could cast an instant.) Flying (This creature can't be blocked except by creatures with flying or reach.) When Spectral Adversary enters the battlefield, you may pay any number of times. When you pay this cost one or more times, put that many +1/+1 counters on Spectral Adversary, then up to that many other target artifacts, creatures, and/or enchantments phase out (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.).