This should get you off to a good start with the Night Witch: you can also watch Baba Lysaga (or Baby Lasagne) played in one of my favourite episodes of Tolarian Community Colleges Shuffle up and Play series, focused on Budget Commander decks, which should give you some additional ideas on how to build her without breaking the bank: Wilhelt, the Rotcleaver Innistrad: Midnight Hunt brought us the Undead Unleashed precon and, right out of the box, this deck plays pretty well
Commander is usually exclusive to black-bordered card, but if your local group decides to open the can of the silver-bordered world you end up with a few more choices to work with
Believe it or not, the fight was allegedly over Pokmon cards
113 Mega Zygarde ex
This is a nice card all by itself, as it can win the game on its own
Investment Guide Beartic, the Freezing Pokmon, stands as a formidable Ice-type introduced in Generation V