Secret Coven Meetings

Each player sacrifices a nontoken creature. Then
you may cast any number of creatures from your graveyard without paying their mana costs with a total mana value less or equal to the total mana
value of the sacrificed creatures.

Witchcraft—If there are six or more witches on the battlefield under your control and/or in your graveyard, Secret Coven Meetings deals damage to target creature or planeswalker equal to the number
of creatures that died this turn.