Mana Bloom enters the battlefield with X charge counters on it.
Remove a charge counter from Mana Bloom: Add one mana of any color. Activate this ability only once each turn.
At the beginning of your upkeep, if Mana Bloom has no charge counters on it, return it to its owner's hand.
10/1/2012 Mana Bloom’s last ability will trigger only if it has no charge counters on it at the beginning of your upkeep. If it has one charge counter on it as your turn begins, you won’t have priority to remove the counter until after this check.