Faeburrow Elder not only taps for 1 mana of each color among permanents you control, but it also grows larger with every color represented, so its both a ramp engine and a solid body
(Seriously, the card isn't legendary itself, and the Demons aren't legendary either.) You can use high quality Demons like Shadowborn Demon, which has a cool trigger, or other classics like Rune-Scarred Demon
Both staples roughly doubled in price early last week before losing about 20% of those gains, and those new price points look like theyre going to be pretty stable for the next couple of weeks at least
I wasn't exactly sure what the common cards to cut from the main deck to make room for important sideboard cards
After all, Magic: The Gathering was the first modern trading card game, and the TCGs that followed it predictably borrowed elements from the grandfather of the genre