Calathea?

It does look like something from Marantaceae family. I briefly tried to find a matching Calathea & Maranta, but failed. Is it a bulb? If it is, maybe an Alocasia, or Caladium.

It looks like one of the Thai hybrid Caladiums.

Hi Tiffany & Ricky, thank you for your input. Will check if the plant has a bulb.

It does look like a Caladium's Thai Beauty leaves form but never seen this pattern on the caladium. Maybe is really a new species.

Here're more pictures of the plant leaves.

Are there genicula on the petioles?

Doesn't look like it in the photos.

what a fantastic plant! i also thought about Homalomina first and Caladiums second.

The plant doesn't have a bulb after examined. I don't see any genicula on the petioles as well.

can you see if there is a fattened underground stem (tuber) from which the roots are growing? like on alocasias? if you poke with a finger, without disturbing too many roots, you should be able to determine if it's there or not.

the stem growth reminds me of aglaonemas. but that's definitely NOT an ag.

i'm thinking that it should have some kinda underground 'thing'..corm..whatever..

Calla lilies have corms, yours might be very young, so quite small. it'll get bifgger and offset more with time. it does look similar. see here

i also see pics of 2 more similar cultivars on UK sites: 'Green Zebra' and 'Zebra'

Zebra

I think this is solved, Zantedeschia cultivar!