In Standard and Pioneer, Monastery Swiftspear, Slickshot Show-Off, Emberheart Challenger, and others are paired with burn spells and auras to reduce the opponents life total quickly
Untapping any permanent has a dazzling array of uses, from netting you extra card draw with The One Ring to setting up combos with Gaeas Cradle and friends
Sure, your opponent can destroy this enchantment in order to undo the damage, but youll hopefully have already managed to turn the tides in your own favor by the time that they find an answer
Unfortunately, its not very good
Hickeys can come in many different shapes, sizes, and colors and are most notably identified by a miscolored blot with a miscolored 'halo' around its edges