Ventifact Bottle

[Variable Colorless][1], [Tap]: Put X charge counters on Ventifact Bottle. Activate this ability only any time you could cast a sorcery.

At the beginning of your precombat main phase, if Ventifact Bottle has a charge counter on it, tap it and remove all charge counters from it. Add [1] to your mana pool for each charge counter removed this way.