I like that the deck lets you play around with its many options for LOTR commanders
The critical difference with Scam is it relies on doing a powerful thing on turn one to generate a large advantage, then using the Jund-style cards to disrupt the opponent enough to finish the job
Fiery Confluence: I almost put this card into its own section, since it isnt necessarily a sideboard-only card, but it certainly fits the role of utility card exceptionally well
The precon deck came with a few landfall creatures in Avenger of Zendikar, Scute Swarm, and Rampaging Baloths, so it was an easy call to throw in a few more
Protective Embrace, which allows you to apply Ward to other characters you control
This would usually include Baby Pokmon or Magikarp in Water-type decks