Your search for "D/D Necro Slime MP16-EN115" revealed the following:
D/D Necro Slime - GFP2-EN075 - Ultra Rare - 1st Edition
Ghosts From the Past: The 2nd Haunting 1st Edition
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D/D Necro Slime - GFP2-EN075 - Ultra Rare - 1st Edition from Ghosts From the Past: The 2nd Haunting 1st Edition, available at 401 Games Canada. Rarity: Ultra Rare Card Text:If this card is in your Graveyard: You can Fusion...
D/D Necro Slime - DOCS-EN012 - Common - Unlimited from Dimension of Chaos Unlimited, available at 401 Games Canada. Rarity: Common Card Text:If this card is in your Graveyard: You can Fusion Summon 1 "D/D/D" Fusion Monster from your Extra...
D/D Necro Slime - MP16-EN115 - Common - 1st Edition from 2016 Mega-Tin Mega Pack 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:If this card is in your Graveyard: You can Fusion Summon 1 "D/D/D" Fusion Monster...