Mana Harvester

Mana Harvester enters the battlefield with X
charge counters on it, where X is the amount
of mana spent to cast this spell.
{p/g}, {t}: Add X mana in any combination of
colors, where X is the number of charge
counters on Mana Harvester.
{p/u}, {t}, Sacrifice Mana Harvester: Draw a card.