Disetrois, Master of the Roll

{u},{t}: Reroll any die.
{1}{g},{t}:Roll a d4. Each player may put X +1/+1
counters on a creature they control equal to
the result.
{2}{b},{t}:Roll a d6. Each player mills X cards and
then may return a card from their graveyard to
hand with mana value less than or equal to X,
where X is the result.
{3}{r},{t}:Roll a d8. Disetrois deals X damage to
each player where X is the result.