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Astral Cornucopia enters the battlefield with X charge counters on it.
{T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.
If you choose 1 for the value of X, Astral Cornucopia will cost {3} to cast and enter the battlefield with one charge counter. If you choose 2 for the value of X, it will cost {6} to cast and enter the battlefield with two charge counters, and so on.
The last ability is a mana ability. It doesn't use the stack and can't be responded to.
