Your search for "Mask Charge SDHS-EN021" revealed the following:
Mask Charge - SDHS-EN021 - Common - 1st Edition from Structure Deck: HERO Strike 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Target 1 "HERO" monster and 1 "Change" Quick-Play Spell Card in your Graveyard; add them to...
Mask Charge - SDHS-EN021 - Common - Unlimited from Structure Deck: HERO Strike Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Target 1 "HERO" monster and 1 "Change" Quick-Play Spell Card in your Graveyard; add them to your hand....