They are not common, and rather difficult to find
April 2003 Beatdown Monsters 3 Amphibian Beast 3 Blazing Inpachi 3 Gemini Elf 3 Mechanicalchaser 3 Summoned Skull 3 Goblin Attack Force 1 Jinzo Spells 1 Change of Heart 1 Dark Hole 2 Graceful Charity 2 Harpie's Feather Duster 1 Monster Reborn 1 Pot of Greed 1 Premature Burial 1 Raigeki 1 Snatch Steal 3 Soul Exchange 1 United We Stand 1 Upstart Goblin Traps 1 Call of the Haunted 1 Magic Cylinder 1 Mirror Force 1 Solemn Judgment 1 Torrential Tribute Here is the link to the YouTube playlist for this deck: April 2003 Beatdown Monsters 3 Amphibian Beast 3 Blazing Inpachi 3 Gemini Elf 3 Mechanicalchaser 3 Summoned Skull 3 Goblin Attack Force 1 Jinzo Spells 1 Change of Heart 1 Dark Hole 2 Graceful Charity 2 Harpie's Feather Duster 1 Monster Reborn 1 Pot of Greed 1 Premature Burial 1 Raigeki 1 Snatch Steal 3 Soul Exchange 1 United We Stand 1 Upstart Goblin Traps 1 Call of the Haunted 1 Magic Cylinder 1 Mirror Force 1 Solemn Judgment 1 Torrential Tribute Here is the link to the YouTube playlist for this deck:
While the price was definitely lower than usual, nothing else in the listing seemed out of the ordinary
This is the most powerful thing you can stick on your typical ETB trigger
Competitive Play Cards used in Standard, Modern, Pioneer, Legacy, and other formats can spike when a deck performs well
From the looks of things, Wizards of the Coast is going to let the Allosaurus Rider Neoform deck be legal post-transition to the London Mulligan rule for at least some time, so having access to Force of Negation helps prevent you from dying to nonsense before you even manage to cast an Aether Vial
