Cole, Lord of the Unfortunate

You must cast this commander if able.
Whenever an opponent loses life, you lose half
that much life, rounded up. Spells you cast cost
X less to cast, where X is the life you have lost
since your last turn.
{2}{t}: Roll a d20. On a roll of 20, you gain 20 life.
On a roll of 1, each opponent sets their life total
to X, where X is their life total minus the life you
have lost this game.