Liliana, Untouched by Death

Every loyalty ability here is conditioned on Zombies, which makes this the rare planeswalker that does almost nothing as a goodstuff inclusion and everything as a tribal payoff. The +1 mills three, and if a Zombie card turns up among those three, it swings four life; the drain is a lottery on the top of your library, not a reward for a graveyard already stocked. The -2 shrinks a creature by exactly the number of Zombies you control, so it scales from a polite nudge to a lethal removal spell depending entirely on your battlefield. The -3 turns the graveyard into a second hand of Zombie spells for the turn, and that ability is the one that tells you what she is for. Black has always paired Zombies with self-mill, and the tension in any mill-your-own-library plan is that you bury your threats along with your fuel. The -3 resolves that tension directly: whatever Zombies the +1 dumps become castable, so the deck's two halves feed each other instead of competing for the same library. None of this is incidental. The whole kit is engineered so a Zombie deck's natural game plan also grows her into a removal engine and a recursion engine at once, the +1 seeding the yard the -3 then spends. Outside that shell she is a four-mana planeswalker whose lines mostly whiff, which is the price of aiming every ability at one creature type.