Unfortunately, one of the best Liliana planeswalkers — Liliana of the Veil — is not legal in pioneer. But Wizards of the Coast has circumvented that by giving players Liliana, Waker of the Dead.
The difference between the cards is that the new Liliana costs 1 mana more than Liliana of the Veil. That's okay, though, because the card also has an extra loyalty counter. This can play a big role in your strategy if you're aiming to use the card's powerful ultimate ability.
Liliana will be terrific in Sultai Delirium and Dimir Control decks in pioneer.