Wonder Picks in Pokemon TCG Pocket are used to select one card from among five, increasing the odds of getting a particular card versus opening packs
Obviously, this fits into the giving aspect of the holiday, but it's also a way that you can try to use the 7 damage effect to your advantage
Creepy Doll can help keep you alive for longer if your opponent doesnt have creatures with trample or evasion of some kind
Putting the counters on Kathril seems like a good plan if you don't have anything more interesting like a Hydra Omnivore to put them onto
It depicts Elsa striding into the unknown, surrounded by swirls of magic and is one of the new dual ink cards, being an amethyst/sapphire mix
Combine it with discard like Sire of Insanity or damage doublers like Obosh, the Preypiercer for a game where every choice your opponents make becomes painful