Unstable Servotitan

Vanishing 1 (This creature enters the battlefield with
one time counters on it. At the beginning of your
upkeep, remove a time counter from it. When the last
is removed, sacrifice it.)

Unstable Servotitan's power and toughness are equal
to the number of time counters on it.

When Unstable Servotitan enters the battlefield,
time travel X times.