welcome !
For me it's obviously Wesley Fofana. His natural ability on a Rugby field is just abnormal, and with the work he's put in, he's one of the best Rugby players of this decade altogether. Unfortunately, he like many suffers from being a guy who first appeared under the worst coaching staff in major Tier 1 Rugby history.
A guy who hasn't been capped much (just the last June tour, some minutes) but who's just incredible is Rémi Lamerat. When he gets traded away from small market Castres and integrates a big team, he's going to be all over Rugbydump, YouTube, etc...: offloads, hard running, playing through contact, real no.12 playmaking, consistent spot-on no look passes, sound defense, huge heart and then just his physicality, he smashes through anything he sees and needs 2 guys to put down quasi-always.