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 lose 2 life for each despair counter removed this way. If they do not, they lose 1 life for each despair counter they have.