How much mana does tapping a Forest make, with Nikya of the Old Ways & Nyxbloom Ancient?

Question

I have Nikya of the Old Ways out on the battlefield:

Whenever you tap a land for mana, add one mana of any type that land produced.

I play Nyxbloom Ancient:

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

I tap a Forest. How much green mana do I make?

Which of the following answers is correct?

• (1+1)x3=6
• 1×3+1=4

I'm confused about the order of the calculation. An explanation is much appreciated.

Answer 1

Nikya's ability doesn't cause the Forest to produce {G}{G}; it still produces {G} and Nikya's triggered ability produces another one. You don't tap Nikya for mana, so Nyxbloom Ancient only applies to the original {G} from the forest and you make 4 green mana.

Now, two Nyxbloom Ancients would stack, cf. the following ruling on Mana Reflection:

The effects of multiple Mana Reflections are cumulative. For example, if you have three Mana Reflections on the battlefield, you’ll get eight times the original amount and type of mana.