Do this right and you can quickly power up Jungle Dump an attack that does 240 damage, heals your Mega Venusaur ex for 30 damage, and has no other adverse effects
Ayara, First of Locthwain Ayara, First of Locthwain often helms mono-black Commander decks
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
Key chase cards include Latias Ex #87, Alolan Exeggutor #89, Archaludon Ex #88, Alolan Exeggutor Ex #92, Latias Ex #78, Flygon Ex #79
Sun Titan [Best Recursion Engine in White] Sun Titan is how white turns the graveyard into a toolbox