Shards of Greed

Shards of Greed enters the battlefield tapped. You may choose not to untap Shards of Greed during your untap step.
At the beginning of your upkeep if Shards of Greed is tapped, you may put a Shard Counter on it.
{t}, remove a Shard Counter: Add one mana of any color.
{t}: Add {c} to your mana pool.
Remove three Shard Counters, sacrifice Shards of Greed: Draw two cards.