For the Final Fantasy x MTG crossover, those powerful monsters were adapted by combining creatures and sagas for the first time in Magics history
In this case, we've basically struck out
That being said, I think this likely ends up not turning on often enough to be worth it in actual play, or in the case of Domain the extra 1 damage isn't what you need, it's to remove the Leyline of the Guildpact
Strategic reasons to also bounce our own include getting rid of awkward Auras or resetting for some great enters-the-battlefield triggers
Once Screaming Nemesis's last ability causes it to deal damage to a player, that player won't be able to gain life for the rest of the game
New Ability Word: Survival When you're stuck on Duskmourn, there's only one goal: survival