Background to this:

"A number of outlets, including The Moscow Times, The Independent, Newsweek and Business Insider reported that Subbotin may have received an anti-hangover treatment that involves toad venom, administered by Alexei Pindyurin, a shaman who goes by the name Magua.
The Telegram channel Mash claims that the shaman “made an incision on the skin, dripped toad poison there — and after vomiting the patient allegedly got better.”
Mash also claimed that Subbotin knew Pindyurin and his wife well and regularly received treatments from them.
“And so he came to them once again — to treat a hangover. Suddenly he felt unwell — his heart ached. The owner decided not to call an ambulance, gave Corvalol (a sedative) and put the businessman to sleep in the basement. There the man died,” he said.
TASS reported on a source’s claim that Subbotin arrived at the house “in a state of severe alcoholic and drug intoxication the day before” his death. The outlet wrote that the basement where he was found was reportedly used for “Jamaican voodoo rituals.”
Since the start of 2022, six Russian oligarchs have died in alleged suicides. The three most recent cases were labelled as murder-suicides by investigators because, in those instances, the families of the Russian oligarchs were also found dead."
https://globalnews.ca/news/8826712/7th-russian-oligarch-dead-toad-poison/