Lucifer, Apocalypse

As an additional cost to cast this spell, you may sacrifice any number of other non-token creatures. This spell costs 1 mana less to cast of that creature’s color identity. This ability cannot reduce the mana in that cost to less than 1 mana.
Flying, indestructible
Whenever Lucifer, Apocalypse attacks, each opponent loses 7 life unless they sacrifice two creatures.