Euridia, Witch of Perdition

Euridia, Witch of Perdition can't be sacrificed.
Whenever you cast Euridia, Witch of Perdition,
create a 1/1 black Minion creature token for each
creature that died this turn. They can only be sacrificed to Euridia, Witch of Perdition.
Sacrifice thirteen creatures: Exchange life totals
with target opponent.