Vesuvan Phantasm

{x}: Exile Vesuvan Phantasm from your hand
face-up with X Mind counters on it.
If Vesuvan Phantasm is exiled, you may gain
control of target creature with a toughness less
than or equal to the number of Mind counters
on Vesuvan Phantasm. If you do, it loses all
other abilities and counters and gains:
"{x}{u}{u}: Put Vesuvan Phantasm in play under
your control with X +1/+1 counters. Only an
opponent may activate this ability."