I recently saw this plant in a shop. It looks like an amazingly big succulent.
What kind is it? I wonder if it needs much light and if it produces flowers?
Zoom to the area where flowers emerge (I suspect):
It reminds me of a Night Blooming Cereus. I've never grown one, so can't comment on their need. My folks have theirs growing in normal household conditions, getting western light. They are amazing plants - sending up fragrant blooms that last a single night. This page seems to offer a decent overview.
On first sight i also thought it was sone kind of fern but the zoom shows definitely a cactus. What you were zooming in at is a new leaf , not a blossom. In my opinion it is species out of genus Epiphyllum.
From your photos it is hard to determine which species exactly so i would suggest to google "epiphyllum" and look for photos.
Edit: maybe epiphyllum oxypetalum, due to the thin, fernlike leaves, but this is mere speculation.
Edit 2: Night-blooming cereus (selenicereus grandiflorus) is definitely wrong. Those have angular stems and nothing that resembles leaves.
Final edit: I am quite sure now that itis epiphyllum oxipetalum. I found a video on youtube featuring the plant: https://m.youtube.com/watch?v=CXxFdpT7CZA
This one of the 'Bird's Nest Ferns'...a very sick one at that. These plants need an awful lot of humidity, perfect fluffy soil (potting soil), acidic soil, no tap water, water that is pure pure pure. Very sensitive. The perfect combination of chemicals (fertilizer), lots and lots of micro/macro organisms. You'll find these in stores sold as house plants. Very few ever make it for long unless its owner understands a fern's needs.
Certainly not a succulent which is a desert plant. This is a rain forest plant. You should see how beautiful these are when healthy. You'd have to go to a production greenhouse dedicated to growing ferns. They last long enough to make the owner feel as if they've done something wrong. They either quit purchasing plants and call themselves a black thumb, OR they'll try again buy purchasing even more 'stuff' to baby their plant.
Ferns do not produce flowers nor seed. They produce spores for reproduction.
Here's a photo and information on Kangaroo Fern (Microsorum diversifolium - not entirely sure it is that, but it might be. Obviously, the one in your pictures isn't in great condition. I'm not sure it's exactly the right one, but I can't think of any other that I know that it might be. No flowers, bit of a sprawler and its an epiphytic fern. I don't think it's attractive in any way, but each to his own, we're all different and have different tastes.