Your search for "Acidic Slime 218" revealed the following:
Acidic Slime (C18) from Commander 2018, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Karl Kopinski Card Text:DeathtouchWhen Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.
Acidic Slime (M3C) from Modern Horizons 3 Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Karl Kopinski Card Text:DeathtouchWhen Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.
Acidic Slime - C18 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Karl Kopinski Card Text:DeathtouchWhen Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.
Acidic Slime - Prime Slime (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Wizard of Barge Card Text: Prime SlimeDeathtouchWhen Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.