Forsaken Heatwurm

Suspend 5 — {s}{s} (Rather than cast this
card from your hand, you may pay {s}{s} and exile it with 5 time counters on it. At
the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)
{t}: Add {s} to your mana pool.