Liliana offers recursion, hand control, and planeswalker value in a single card, flipping easily in sacrifice-based decks
A 3/3 for 4 mana isnt very impressive, even with deathtouch, and its triggered ability isnt all that exciting either
It's entirely proxied, which makes updating it easy if you dont mind spending an afternoon with some scissors and card sleeves
It also means that even if your spell is countered, you still get a token to use, which is awesome
A creature with offspring and an effect that can be used to trigger valiant on other creatures for free
You can still burn or counter anything you need to to stay alive in the early game, and then once Niv-Mizzet, VisionaryNiv-Mizzet, Visionary comes down, the burn spell you have left over is a draw spell