Category 3: Prototypes and printing errors The Blastoise Presentation Galaxy Star and the Topsun Charizard Blue Back fall into this category
Ancient Stone Idol Apex Devastator Blightsteel Colossus Darksteel Colossus Desolation Twin Earthquake Dragon Emrakul, the Aeons Torn Emrakul, the Promised End Emrakul, the World Anew Flayer of Loyalties Galactus, Devourer of Worlds Ghalta, Primal Hunger Hierophant Bio-Titan Impervious Greatwurm It That Betrays Kozilek, Butcher of Truth Kozilek, the Great Distortion Krosan Cloudscraper Metalwork Colossus Nyxborn Behemoth Polar Kraken Primeval Protector Primeval Spawn Progenitus Rust Goliath Ulamog's Dreadsire Ulamog, the Ceaseless Hunger Ulamog, the Infinite Gyre Worldspine Wurm
It doesnt have any stipulations beyond that, so Ulamog can eat whatever he wants
It also has a may trigger, so you arent even forced to use its ability if you dont want to
If one or fewer creatures have died under your control during the turn by the time that turn's end step begins, Dark Wings Bring Your Downfall's last ability won't trigger at all
