Migrane

At the start of each opponent's end step, they
discard a card or Migrane does 1 damage to them.
When you discard a card, Migrane causes each
opponent to lose 2 life, you gain life equal to the
life lost this way.
"Few know how many evil religions often start
with a group of in charge. Then, one by one, the
go mad. Only the last one, the one who embraces
it and comes to rule the church entire and know
a kind of immortality."