Gather the forgotten savings

Conceal (Pay any mana to cast this concealed.
Exile it face down and put a number of color
counters on it for each color spent.
You may play the card any time without paying
its mana cost, if the counters provide for it.
Otherwise the spell is put into the graveyard.)
For each color counter on [this] add half the
mana of that color to your mana pool rounded
down.