Ringing Strike Mastery is a common Enchantment — Aura card from Tarkir: Dragonstorm (TDM), collector number 53. Current market price: $0.10 (foil $0.23), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step. Enchanted creature has "{5}: Untap this creature."