While these are powerful cards, if we dont have them out, we need ways to keep digging through our library
Casualty Casualty allows you to sacrifice a creature with power equal to or greater than the casualty number in order to cast a copy of that spell

Abomination, World Ravager Arahbo, Roar of the World Atarka, World Render Call to the Netherworld Conduit of Worlds Crucible of Worlds Drag to the Underworld Emrakul, the World Anew Famished Worldsire Forsake the Worldly Galactus, Devourer of Worlds Hearthhull, the Worldseed Kavaron, Memorial World Koma, World-Eater Leonardo, Worldly Warrior Lost in the Spirit World Lumbering Worldwagon March of Otherworldly Light March of the World Ooze Nissa, Who Shakes the World Nissa, Worldsoul Speaker Nissa, Worldwaker Not of This World Otherworld Atlas Otherworldly Escort Otherworldly Gaze Otherworldly Journey Otherworldly Outburst Path to the World Tree Phylath, World Sculptor Polukranos, World Eater Pyre of the World Tree Rescue from the Underworld Sentry of the Underworld Song of the Worldsoul Step Between Worlds Storm World Terrian, World Tyrant The Underworld Cookbook The World Spell The World Tree This World Belongs to Me Travel the Overworld Tribute to the World Tree Underworld Breach Underworld Cerberus Underworld Charger Underworld Coinsmith Underworld Connections Underworld Dreams Underworld Fires Underworld Hermit Underworld Rage-Hound Underworld Sentinel Venus, Torn Between Worlds Wand of the Worldsoul Warp World Weight of the Underworld World Breaker World Champion, Celestial Weapon World Map World Queller World Shaper World War Hulk World at War World-Bottling Kit World-Weary Worldfire Worldgorger Dragon Worldheart Phoenix Worldknit Worldly Counsel

Hybrid mana cards can be cast using one of two colors, increasing deck-building flexibility
Raise the Past With quite a lot of meta decks and even FNM-value-oriented ones being on the one-two-three curve, Raise the Past suddenly becomes an instant full copy pick