Syr Konrad, the Grim

Whenever another creature dies, or a creature
card is put into a graveyard from
anywhere other than the battlefield, or a
creature card leaves your graveyard,
Syr Konrad, the Grim deals 1 damage to each opponent.
{1}{b}: Each player mills a card. (They each put the
top card of their library into their graveyard)