How would Agatha of the Vile Cauldron reduce an ability cost from 2 Colourless 1 Red

She has an ability that says, "Activated abilities of creatures you control cost X less to activate, where X is Agatha of the Vile Cauldron's power. This effect can't reduce the mana in that cost to less than one mana." I'm wondering if she had a power 2 or more would an ability that cost 2 Colourless and 1 Red be reduced to one of each or just 2 red. I'm asking because the effect specifically states "This effect can't reduce the mana in that cost to less than one mana" so I believe it would be 1 red, but my pod keeps telling me that's not how it works. Thanks in advance.

Wasn't sure which to flair this, sorry if it's the wrong one.

Link to card image
https://cards.scryfall.io/large/front/d/6/d6c48f07-63b7-4a60-8da6-ce77405abf1e.jpg?1693248393