When putting a save in one of these slots, it will be ready for you to pick back up later
Look at target opponents hand and choose X cards from it
Then theres Crackling Spellslinger, which gives the next instant or sorcery you cast this turn storm
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
Even targeted removal will trigger their abilities from Nadu, digging through their library and ramping aggressively while pulling exactly the cards they need to win