Malum, Symbol of Doom

When Malum is unsealed, it's owner wins the
game. During each player's upkeep, Malum's
owner takes 1 damage.
{2}{b}: Sacrifice a non-land permanent you own,
and discard a card. This can only be used once per
turn.
Sealed 3 (During each of your upkeeps, if Malum
has activated it's ability 3 times or more since
it was cast, it is unsealed.)