Emerge doesnt change the speed in which you can cast the spell, so it depends on the emerge spell itself
That makes it incredibly sought after, and far more difficult to get in the West
That being said, this is purely speculative since none of these cards are playable yet
This list is the cream of the crop thats not already in the top 74: Abstruse Appropriation Accursed Marauder Amphibian Downpour Argent Dais Arna Kennerd, Skycaptain Branching Evolution Breya, Etherium Shaper Crabomination Dreamtide Whale Emperor of Bones Estrid's Invocation Genku, Future Shaper Glimpse the Impossible Grim Servant Kaalia of the Vast Kudo, King Among Bears Monstrous Vortex Nesting Grounds Pearl-Ear, Imperial Advisor Phelia, Exuberant Shepherd Powerbalance Rosheen, Roaring Prophet Sevinne's Reclamation Shadow of the Second Sun Shilgengar, Sire of Famine Solar Transformer Sowing Mycospawn The Necrobloom Thraben Charm Volatile Stormdrake Wheel of Potential Wight of the Reliquary #74
On top of that, the ability to scale its damage with additional mana makes it a flexible tool in the mid-to-late game
Each weapon is also a Clue in addition to an equipment, but they are also not used in decks for gameplay of Ravnica: Clue Edition
