There are Elf cards that make tokens when you play another Elf, like Lys Alana Huntmaster, and this allows Cloakwood Swarmkeeper to build up counters to make your battlefield get out of hand quickly
sometimes, there are enough independently powerful cards in a format and good enough answers that synergies will reliably get torn apart and building toward them is a fools errand
This is a fun, powerful way of modifying your combo-centric Creature typal cards to meet your needs
Palace Jailer The real value of Palace Jailer and what sets it apart is that it can make you the monarch, which is free card draw every turn in white (in the worst card draw color, no less)
I like this in legends matter decks quite a bit, and even in some artifact builds like Osgir or Gerrard
What are your favorite artifacts to return from the grave