Dice with Death

During your upkeep, roll a six sided dice, if you roll 4 or greater target opponent loses 10 life. If you roll 3 or less you lose 10 life.
This ability activates when you have 10 life or less.
Pay 5 life: You may re-roll your result. Activate this ability only once during your turn.
"Life is always a risk, is it one you are willing
to take?"