The Cursed End

Choose {x} creature names.
Each opponent sacrifice {x} creatures with those
chosen names.
If {x} is equal or greater than 3, each player
sacrifice all creatures and planeswalkers.
If 7 or more non-token permanents were
sacrificed this way this turn, at the and of your
next end step you loose the game.
It all started with one dead person. Here I am now, witnessing humanity's lasts moments...