Throne of Pain

Each opponent sacrifices two creature. For each
creature sacrificed this way, you create two 2/1 black
Demon creature tokens with deathtouch.

If six or more creatures leave the battlefield this
way, you may search your library for a card named
Gelor, Lord of Pain, reveal it, and put it into play.

"From the shadowed throne, his power demands
sacrifices, and the weak are cast aside in the name
of his ambitions."