You don't have to wait until a Living Death is needed later, you can drop it and the earlier the better since it'll be more powerful
Realmwalker found its home in Historic elves
If you can keep this Lilo protected with, let's say, Simba, Protective Cub which costs only two ink to play, Lilo can start to get you an early lead when it comes to lore
In case you missed it, the reason we have two different versions of this particular promo is because one is the regular Enchanted version you can find in packs (if you get insanely lucky) while the other is actually going to be the Set Championship Promo card
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Blasphemous Act)
Attacking creatures you control get +1/+1 until end of turn