Encantamento
Toda vez que uma criatura que você controla morrer, exile-a.
No início de cada etapa final, se você não controlar nenhuma criatura, sacrifique Promessa do Amanhã e devolva todos os cards exilados com ela ao campo de batalha sob seu controle.
If you control more than one Promise of Tomorrow, each creature you control that dies will cause the triggered ability of each of them to trigger. Those abilities can be put on the stack in any order, and the first one to resolve is the one that exiles the creature card. That creature card will be exiled by that Promise of Tomorrow, and only that Promise of Tomorrow can return it.