Stoneroot

Stoneroot enters play with nine future counters
on it. During your upkeep, remove a future
counter from it. If you cannot, or if Stoneroot
has more than 19 future counters, transform it.
{t}: add {c} and lose 1 life.
Sacrifice a creature, {t}: add {c} equal to that
creature's converted mana cost and put a future
counter on Stoneroot for each mana symbol in
its mana cost.