Your search for "festering mummy 91" revealed the following:
Festering Mummy (AKH) from Amonkhet, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Christopher Burdett Card Text:When Festering Mummy dies, you may put a -1/-1 counter on target creature.
Festering Mummy (Foil) (AKH) from Amonkhet, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Christopher Burdett Card Text:When Festering Mummy dies, you may put a -1/-1 counter on target creature.