This is fine filler if you have enough cheap attackers but only because it is a powerful card
Being a black artifact limits its flexibility: You can only play it with commanders that include black in their color identity
This land card can tap for one colourless mana, tap for one mana of any colour as long as its for a legendary spell, and add one mana of any colour among legendary permanents you control
Paired with hyper-aggressive cards like Lilo, Making a Wish and Maleficent, Biding Her Time, Stitch, Rock Star can help you quickly create a board state that's almost impossible for your opponent to deal with
Liliana is powerful, cheap and versatile and this makes her a card you can play in most things
In the first few turns, I figure getting a Lander token is better than drawing a card, but then Landers start to drop off in value, massively dropping later game