The plant in the picture is Hypoestes phyllostachea, Polk Dot Plant. Whether the plant you saw is the same we can't tell without a picture of the actual thing.

I wonder if the OP's mystery plant is something like string of hearts, Ceropegia woodii?

@gardengal48 the OP’s mystery plant is a trailer while the one in the picture is indeed the polka dot plant.

GG’s suggestion, Ceropegia woodii, is a trailer. Without a picture of the mystery plant, or confirmation by the OP of any suggestions, we will never know.

I actually bought the Hypoestes phyllostachya. It came so tiny!!! I am wondering to what size it can grow? The plant came in a 2” pot . From the picture I think you can get an idea of how tiny it is! Please advise on its care. TIA!

For size

Adorable! Bigger pot, a bright window, don't let it get too dry. Not an idea houseplant, IMVHO, because it's so seasonal and scares people into thinking it's dead over winter. Over summer, the stems can grow from 6" to 2 feet tall, then the tips turn into much taller inflorescences. Over winter, the old stems are discarded, and soon after, new stems grow from the crown/rots. Starting with such a small specimen, it might not bloom this year.

Thanks Tiffany! Can you tell me if I should transfer to a bigger pot at this point? It is getting enough sun because its next to a sunny window. I appreciate it very much!

Hi there! so I transfered the Polka Dot plant to a new pot, a little bigger this time, but it doesnt seem to be doing well! suggestions on how to revive it?

Likes moisture, heat, is it inside?

Yes it’s inside facing a sunny window and it’s a little cooler today. For humidity, I am going to purchase pebbles, play them on a saucer and lay the plant on them. That apparently is a humidifying option.

If you don't run the A/C too much, it could go well. A little out of my depth discussing a summer inside. I've kept these inside over winter, but not summer.

Speaking of winter, don't panic if the current stems die back after blooming. That's normal. New stems will sprout from the crown soon after.

The A/C is almost always running! My plants don’t seem to mind too much haha. I have 2 grow light bulbs, but may have to invest in a gro light stand or two as the weather gets cooler. Right now the tropicals are sitting on a coffee table facing a window with bright sunlight and they are mostly doing well.

Let us know how it goes.

They do well in terrariums for moisture in the surrounding air. Do you have a large glass jar you could put the pot in?

I have a large plastic container (an empty mixed nuts container).. would that possibly work?

Probably, as long as it’s thoroughly washed. You could invert it over the pot.