He Who Walks Through Time

He Who Walks Through Time enters the
battlefield with seven time counters.
You may untap He Who Walks Through Time
each time you cast an instant or sorcery spell.
He Who Walks Through Time does not untap
during your untap phase.
{t} Remove a time counter from this creature.
Take another turn after this one.
Exile this creature if it has no time counters on it.
Ah time. When shall we go today?