Your search for "Cipher Mirror Knight DPDG-EN037" revealed the following:
Cipher Mirror Knight - DPDG-EN037 - Common - 1st Edition
Duelist Pack: Dimensional Guardians 1st Edition
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Cipher Mirror Knight - DPDG-EN037 - Common - 1st Edition from Duelist Pack: Dimensional Guardians 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:When a "Cipher" monster you control is destroyed by battle and sent to your Graveyard:...
Cipher Mirror Knight - MP17-EN136 - Common - 1st Edition from 2017 Mega-Tin Mega Pack 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:When a "Cipher" monster you control is destroyed by battle and sent to your Graveyard:...