19 cards where the set is “hho” and the collector number >= 1 and the collector number <= 999

Fruitcake Elemental (Happy Holidays #6)
Gifts Given (Happy Holidays #7)
Evil Presents (Happy Holidays #8)
Season's Beatings (Happy Holidays #9)
Snow Mercy (Happy Holidays #10)
Yule Ooze (Happy Holidays #11)
Naughty // Nice (Happy Holidays #12)
Stocking Tiger (Happy Holidays #13)
Mishra's Toy Workshop (Happy Holidays #14)
Goblin Sleigh Ride (Happy Holidays #15)
Thopter Pie Network (Happy Holidays #16)
Some Disassembly Required (Happy Holidays #17)
Bog Humbugs (Happy Holidays #18)
Decorated Knight // Present Arms (Happy Holidays #19)
Topdeck the Halls (Happy Holidays #20)
Last-Minute Chopping (Happy Holidays #21)
Treasure (Happy Holidays #21★)
Chaos Wrap (Happy Holidays #22)
Seasonal Sequels (Happy Holidays #23)

This search is finished. Now the real work can begin.