Born in the small Eastern Cape town of Ngcobo, Dyantyi represented the as a fly-half at the 2007 Under-13 Craven Week tournament held in Krugersdorp. However, he missed out on provincial selection at high school level and did not even play for the Dale College Boys' High School first XV after being deemed too small.
University and youth rugby (2013–2015)
After school, Dyantyi enrolled at the University of Johannesburg to study a B.Com. in marketing and he mainly played soccer, but returned to rugby after friends invited him to play in UJ's internal koshuis league. He represented UJ in the Young Guns competition in 2014, as well as playing some rugby sevens for the university. In 2015, he played for the senior team in the Varsity Cup — scoring one try in the competition in a 46–10 victory over the — and linked up the Under-21 team of city's professional rugby team, the, scoring four tries in the Under-21 Provincial Championship as the team reached the semifinals of the competition.
After further appearances for UJ in the 2016 Varsity Cup — scoring a further four tries as his team reached the semifinals — Dyantyi signed his first professional contract with the, and made his first class debut for the side in their final match of the Currie Cup qualification series against the in Grabouw. He again represented UJ in the Varsity Cup in 2017 before making one more first class appearance for the Golden Lions XV in the newly-created Rugby Challenge competition, scoring his first points at this level by scoring two tries in their 35–25 victory over the in Johannesburg. He was included in the squad for the 2017 Currie Cup Premier Division, and he made his debut in that competition by starting in their Round One match against the. In addition to making his Currie Cup debut, Dyantyi also scored his first Currie Cup try in a 36–43 defeat. He scored another try in their next match against, and followed that up with a double the following week against trans-Jukskei rivals the. He remained in the squad for the remainder of the competition, eventually featuring in all 13 of his side's matches, scoring further tries in their return match against the Blue Bulls and their penultimate match of the regular season against to help the Golden Lions finish in third spot and secure a semifinal berth. The team fell short at that stage, losing 5–19 to Western Province in Cape Town.
In 2018, Dyantyi was named in the squad for the 2018 Super Rugby season. He was named on the left wing for their first match of the season against the to make his Super Rugby debut, and took just 22 minutes to score his first Super Rugby try in a 26–19 victory. He scored two more in their next match, a 47–27 victory over Argentine side the, and scored further tries against the and as he firmly established himself as the team's first choice left wing. A torn pectoral muscle ruled him out for six weeks, but he returned for four matches before the break for the June internationals, including a match against the where he played in an unfamiliar outside centre role. South Africa head coachRassie Erasmus included Dyantyi in the national squad for the incoming series against England and he started and scored a try in their 42–39 victory in the first test. He also started their second and third test matches, helping South Africa to a 2–1 win in the series. He returned to Super Rugby action, playing in their final two matches of the regular season and scoring a try in their match against the to help the Lions finish top of the South African Conference. A win over the Jaguares in the Qualifiers was followed up by a 44–26 win over the in the semi-finals — with Dyantyi scoring a 26th minute try — to qualify for the final. Dyantyi was named on the bench for the final against the and could not prevent his side losing the match 18–37 in Christchurch to finish the competition as runners-up. Dyantyi's try haul of seven tries was the joint-second most by a Lions player'; replacement winger Madosh Tambwe also scored seven while hooker Malcolm Marx topped the try-scoring charts with 12 tries. He was again named in the South Africa national squad for the 2018 Rugby Championship, and scored two tries in his first start in this competition, a 34–21 victory over in Durban. He started in losses away to Argentina and before scoring two tries in their 36–34 win over, their first victory in New Zealand since 2009. He also scored a try in their next match — a 23-12 win against Australia — after just 25 seconds.
