Ifira's Eternal Goblet

Ifira's Eternal Goblet enters the battlefield with
three flame counters on it.
{t}: Add {r}
Remove a flame counter: Untap Ifira's Goblet. If
zero flame counters are left, sacrifice it.
{r},{t}: Put a flame counter on Ifira's Eternal
Goblet then, if it has six or more flame counters
on it, transform it.