Real-life Exodia Decks are typically filled with cards that either allow the player to draw more cards or search out Forbidden One monsters
Also the archetype has a lot of Spells and Traps that can make up for their relatively weak attack power such as Harpie's Feather Duster, a reliable Spell card that ANY deck can use to wipe out the opponent's backrow, Harpie Lady Phoenix Formation which can destroy monsters depending on how many Harpies you have and Hysteric Party which can Special Summon as many copies of Harpie Lady from your graveyard as possible
It was an important (almost literal) cornerstone in the culture and history of the Echidnas, which is why Knuckles guards it so diligently
While there's only been a single NM sale around the market price, LP cards offer a decent discount, dropping to about $60.
Take Up The Shield is a useful card in Heroic decks, especially against matchups like Burn that may make things dangerous if you can't gain life
These types of cards naturally create interesting games, as its no longer a given that players will take an available Knock Out, and they must carefully consider whether taking the Prize advantage will be advantageous with their current board state