Cheapest priced copy (Secrets of Strixhaven Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Mana Bloom 
Enchantment · Rare · Return to Ravnica · #130
This enchantment enters with X charge counters on it.
Remove a charge counter from this enchantment: Add one mana of any color. Activate only once each turn.
At the beginning of your upkeep, if this enchantment has no charge counters on it, return it to its owner's hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 130 | Rare | $0.59 | $2.49 |
| Secrets of Strixhaven Commander | 275 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 1 October 2012Mana 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.