Demise Upon The People

Repeat the following process 3 times:
All opponents and creatures you don't control lose X life, where X is the amount of mana used to cast Demise Upon The People unless they discard 6 cards, or sacrafice 4 creatures, or sacrafice 6 lands for each trigger
The golden city that had stood for milleniums shattered under a single blast of Bolas' breath