We knew that four-color decks presented a special challenge for getting access to all of your colors of mana, so we spent some time identifying rare dual lands that we didn't think we'd want to put into booster packs in the near future
But, of course, provided you're keeping two or more cards in your hand when on the receiving end of a discard spell, you should always take into account what kind of synergy or play style will emerge from keeping each set of cards
And that combination with magic really is what exemplifies, to me, the fantasy portion of it. To exemplify the sci-fi vs
Lifegain is one of the best-supported archetypes in Magic, and Heliod is the best lifegain commander thanks to the constant stream of value and combo potential
Undead Servant is definitely below the curve, and despite the potentially high upside (which gets higher in Limited since you can run as many as you want) it wont always be worth playing