As if that wasnt enough, when you order Magic cards chronologically by set then alphabetically by card name, Invoke Prejudice is the 1488th card and was was therefore assigned the ID of 1488 in Gatherer

$2.99 Lightning, Security Sergeant (0462 - Extended Art) Final Fantasy Variants $2.29 Jill, Shiva's Dominant (0438 - Extended Art) Final Fantasy Variants $1.99 Ardyn, the Usurper (0444 - Extended Art) Final Fantasy Variants $4.99 Ultimecia, Temporal Threat (0441 - Extended Art) Final Fantasy Variants $4.49 Zack Fair (0435 - Extended Art) Final Fantasy Variants $1.29 Stiltzkin, Moogle Merchant (0433 - Extended Art) Final Fantasy Variants $2.79 Bartz and Boko (0469 - Extended Art) Final Fantasy Variants $0.99 Ultros, Obnoxious Octopus (0442 - Extended Art) Final Fantasy Variants $1.79 Ashe, Princess of Dalmasca (0425 - Extended Art) Final Fantasy Variants $0.79 Edgar, King of Figaro (0436 - Extended Art) Final Fantasy Variants $0.99 Firion, Wild Rose Warrior (0459 - Extended Art) Final Fantasy Variants $8.99 Rosa, Resolute White Mage (0431 - Extended Art) Final Fantasy Variants 0 results found

The original ruling said that tapping creatures allowed you to reduce the cost of the spell you were casting
Thats a massive price spike of over 2107%
Look no further