Dead Boris, Scathe Lich

At the beginning of your upkeep, each player sacrifices a creature. Each player who can't loses
half their life rounded down.
Whenever a creature an opponent controls dies,
that player may pay {1}. If that player doesn't
create a 1/1 red and black elemental minion
creature token that has "When this creature dies,
deal 1 damage to any target."