Serissa, The Forgiver

Whenever a Demon creature you control dies, you may create a Sin token attached to target creature (They're enchantments with "Enchanted creature can't attack.")

At the beginning of each end step, each opponent loses life equal to the number of Sin tokens on the battlefield.

Serissa, The Forgiver can't be blocked by creatures with Sins attached to them.

{b/r}: Sacrifice a Sin token, draw a card.