Factor in a low mana cost, and youve got an all-star capable of helping you at all stages of the game
When Magic 2011 came out, I spent all the money I had saved up to get a playset of Primeval Titans, and then played the deck almost exclusively until it rotated out
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
It's able to deal well with beatdown or aggro decks thanks to all that lifegain, and can suddenly pull off a win out of nowhere
could it get any better
Hexproofing your other creatures means its something youre going to have to watch out for in a number of ways, although it doesnt do a huge amount against board wipes, and Standard has a lot of those right now