This bug happened in a dungeon run with the Cenarius leader, Coated Spearhead relic, and Primal Air relic that caused cenarius ranged elemental minis to destroy themselves after they’re played. The empty health granted by Cenarius counts as damage in melee range causing Primal Air to proc on cenarius elemental minis, dealing damage to them. This effect did not proc more than once on non-ranged elemental cenarius minis (Faerie Dragon). The Minis who were also considered ranged by the Coated Spearhead relic (Cenarius himself and Moonkin) would additionally poison themselves and cause the effect to repeat until they died, killing themselves before they could do anything. Ranged elemental minis who are not of the cenarius family (Frostwolf Shaman) were not affected as they did not receive the empty health that triggered this interaction.
I came across this bug during a dungeon run and was using the minis in the parentheses. This bug caused me to lose my first attempt on the final boss but I had a retry remaining that I used to test the bug and win. The third relic i had gave a shield that absorbed the first hit against them to my 4 & 5 cost minis.