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Enchant permanent
At the beginning of your precombat main phase, add mana equal to enchanted permanent's mana cost. (Mana cost includes color. If a mana symbol has multiple colors, choose one.)
You get the mana whether you want it or not. If you don’t spend it, it will disappear at the end of the current step (or phase).
If the enchanted permanent’s mana cost is {2}{W}{U}, this Aura’s controller adds {C}{C}{W}{U} to their mana pool. If its mana cost is {X}{G}, this Aura’s controller adds {G} to their mana pool. If its mana cost is {W/U}{W/U}, this Aura’s controller chooses whether to add {W}{W}, {W}{U}, or {U}{U} to their mana pool. The choice may be different each time the ability resolves.
Only the first main phase in a turn is the “precombat main phase,” even if additional main phases are generated by some effect.
This ability isn’t a mana ability. It uses the stack.
