Why, after what we've seen in the last few years with mechanically unique cards, would this be considered to be a good idea
It turns out Liliana is not the only member of the Vess family adept at making zombies, as her undead brother Josu creates zombie knights with menace (which are functionally equivalent to the pirates from Ixalan)
Firstly he is a 0/0 but gains a +1/+1 counter for the amount of mana used to cast him
Its companion restrictionall of your creatures being Cats, Elementals, Nightmares, Dinosaurs, or Beastsis actually very easy to achieve, either in tribal decks or in decks that play very few creatures (or even no creatures at all)
You can only activate the ability once per turn, but thats usually enough in the right decks
Its that idea that makes Control decks so interesting to play, because you have to try and fill your deck with the correct answers to whatever questions your opponents decks are going to have