Your search for "Regeneration 506" revealed the following:
Inkay - 068/103 - Common - Reverse Holo from Mega Evolution: Delta Reign, available at 401 Games Canada. Rarity: Common Finish: Reverse Holo Artist: kawayoo Card Text:[D] Knock Off (10)Discard a random card from your opponent's hand.
Regeneration - Retro Frame (30A) from 30th Anniversary Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Quinton Hoover Card Text:This version of this card has a non-standard Magic back. It is not legal for constructed play.Enchant creatureG:...