For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana
There are some synergies with Rainbow Dash and Fluttershy, which is just as weird to write as it is to read
Additionally, 9% of the time, a regular rare or mythic rare here will be replaced by a showcase sketch rare or mythic rare, retro frame rare or mythic rare, or borderless mythic rare
As far as reprints go, what got Jeremy excited was Villainous Wealth, one of his favorite cards