Rest in Obscurity

Obfuscate all cards in all graveyards.
Whenever a card is put into a graveyard, all players forget about that card.
"Oh no! This is awful, now all th♏︎ ♍︎♋︎❒︎♎︎⬧︎ ♓︎■︎ ⧫︎♒︎♏︎ ♑︎❒︎♋︎❖︎♏︎⍓︎♋︎❒︎♎︎ ♋︎❒︎♏︎ □︎♌︎♐︎◆︎⬧︎♍︎♋︎⧫︎♏︎♎︎✏︎"