(It's not a creature.) If an ability triggers whenever an opponent loses life and its effect causes you to gain life, such as the ability of Exquisite Blood, this will loop until either you win the game or a player takes an action to break the loop
Knocking someone out with this guy and then sacrificing it for Reveillark is the best
(As this Saga enters and after your draw step, add a lore counter Sacrifice after III.) I Gungnir Destroy target creature an opponent controls
1 Leyline of Combustion
Related The decks alt Commander, Carmen, Cruel Skymarcher seems perhaps slightly overcosted at first, but does good consistent work for the deck if you can protect her from removal
Even if there were a deck using Manlands (lands that turn into creatures, ahem) and Crucible of Worlds, so that there might be a reason someone might care enough to try to bring them back into play, there are far more effective cards that can simply destroy their graveyard entirely