Rare Utility Land Cycle These lands are fairly easy to include in 2- and 3-color decks without downside, and once you start activating their abilities, its value town
Big answers like Rune-Scarred Demon and Woodfall Primus
Hangarback Walker is a great card, and its obviously best when you have ways to sacrifice it
The front face of Tergrid can steal any permanents that are discarded or sacrificed, making her a fantastic hand-destruction and forced-sacrifice Commander
Form of Approach of the Second Sun is the absolute pinnacle of the set, but cards like it are the exception
You may find this to be a difficult task, however, as there are many more cards that feel like upgrades than cards that you'll actually want to replace, forcing you to choose which ones you want to make room for