Marsul, Eternal Rage

Whenever Marsul, Eternal Rage would be put
into a graveyard, you may pay {r}, if you do, put
it into exile with 4 time counters on it. At the beginning of you upkeep, remove a time counter
from Marsul, when it has no time counters on
it, put it into you hand.
{r}{r}{r}{r}: Until end of turn, double Marsul's
power and toughness. Put a +1/+1 counter on
Marsul.