Your search for "Dust Knight REDU-EN034" revealed the following:
Dust Knight - REDU-EN034 - Rare - 1st Edition from Return of the Duelist 1st Edition, available at 401 Games Canada. Rarity: Rare Card Text:FLIP: Send 1 EARTH monster from your Deck to the Graveyard.
Dust Knight - REDU-EN034 - Rare - Unlimited from Return of the Duelist Unlimited, available at 401 Games Canada. Rarity: Rare Card Text:FLIP: Send 1 EARTH monster from your Deck to the Graveyard.