Does Nyxbloom Ancient replace the entire mana ability or just the part that produces mana?

Question

Nyxbloom Ancient has the following replacement effect:

If you tap a permanent for mana, it produces three times as much of that mana instead.

I'm wondering whether the replacement effect ("instead") applies to the entire mana ability or just to the part that produces the mana. For example consider Empowered Autogenerator:

{T}: Put a charge counter on Empowered Autogenerator. Add X mana of any one color, where X is the number of charge counters on Empowered Autogenerator.

With Nyxbloom Ancient on the battlefield, do I get to place the charge counter on Empowered Autogenerator?

Answer 1

Nyxbloom Ancient only modifies the mana produced. Empowered Autogenerator still gets a counter.

Rule 106.12b says

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

Empowered Autogenerator's activated ability has two separate instructions: first you add a counter, then you add mana. Only the second part is the mana production event, so only that part gets modified by Nyxbloom Ancient's ability.

Answer 2

Nyxbloom Ancient replaces only the quantity of mana generated, and nothing else. You'll still only be able to cast Eldrazi spells off of Eldrazi Temple, and you'll still take damage from your Sulfurous Springs. So, yes, you will still be able to place a counter on your Autogenerator.

The release notes for Theros Beyond Death state:

Nyxbloom Ancient doesn't produce any mana itself. Rather, it causes permanents you tap for mana to produce more mana. If the mana ability of that permanent puts any restrictions or riders on the mana it produces, that will apply to all the mana it produces this way.

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Some additional support from the rules:

614.1a Effects that use the word “instead” are replacement effects. Most replacement effects use the word “instead” to indicate what events will be replaced with other events.

Nyxbloom Ancient says "it produces three times as much of that mana instead". This indicates that only the quantity of mana produced is being replaced.

614.11b If an effect would have a player both draw a card and perform an additional action on that card, and the draw is replaced, the additional action is not performed on any cards that are drawn as a result of that replacement effect.

This rule specifically calls out that replacing a card draw + rider with an effect also overrules the rider. There is no similar rule for mana abilities, which implies that the riders still take effect.