Junko, Despair Incarnate

Whenever a creature dies, its controller gets a
despair counter.
Whenever another player gets one or more
despair counters, you get that many despair
counters.
At the beginning of each player's precombat
main phase, that player may remove all of their
despair counters. If they do, they draw a card and
lose 2 life for each despair counter removed this
way. If they do not, they lose 1 life for each
despair counter they have.