Jungle Tyrannosaur

Trample, hexproof, menace
If Jungle Tyrannosaur would die, instead exile it with five time counters on it.
At the beginning of your upkeep, if Jungle Tyrannosaur is exiled with an time counter on it, remove an time counter from it. Then if Jungle Tyrannosaur has no time counters on it, return it to the battlefield transformed.