Mana Bloom — ruling 1

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.

Mana Bloom : règles, fonctionnement et interactions (MTG)

Mana Bloom is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

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.

How it works : Mana Bloom

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2012· Wizards of the Coast
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.
No other card is named in this ruling.