Bolt of Sporadicy

When you cast this, roll a d6. On a 1 do 1d8 fire damage, on a 2 do 1d8 frost damage, on a 3 do 1d8 necrotic damage, on a 4 do 1d8 radiant damage, on a 5 do 1d8, on a 6 roll another d6, on a 1-3 cast a random spell you have as a cantrip, and on a 4-6 do 1d8 damage to yourself.