Cinderhole

Hexproof, indestructible
Cinderhole can't block or be blocked.
{r}, {t}: put a soot counter on target creature.
{u/b}, {ut}: Draw 2, put on card from your hand
on the bottom of your library.
Whenever Cinderhole attacks and isn't blocked,
you may pay {2}{r}. If you do, transform it.