Journeying Rock

Indestructible (sort of)
Journeying Rock enters the battlefield with a
journey counter on it.
{r}{t}: Double the number of journey counters
on Journeying Rock. Then, if there are 10 or
more journey counters on Journeying Rock,
put X +1/+1 counters on Journeying Rock,
where X is the number of journey counters on
Journeying Rock.