iambup

{t}{u}: Mind Shackling: roll the die, 19-20, take control of a creature permanent.
{r}{r}{r}: Explode: roll the die and lose 5 life,
1-3, nothing
4-9, do 1 instant damage to any target,
10-15, do 2 instant damage to any target,
16-19, do 4 instant damage to any target,
20, do 8 instant damage to any target.