Sac Lands Fallen Empires introduced the original sac lands, which enter tapped and can tap to add one mana of their respective color, or tap and sacrifice themselves to add two mana instead
deck suffered the most was its inability to incorporate cards from Kaladesh , due to the deck being part of Universes Beyond
Endless replayability The Clue elements of this box can add mystery to any two- to five-player Magic game
When playing five colors, we usually prefer having tri-lands like Arcane SanctumArcane Sanctum
Obviously these may be a miss for your format for other reasons (power, archetype mismatch, rarity, don't run planeswalkers etc) but here's a few that I found interesting, divided by broad category rather than color: Actual Modal Dual Faced Cards: While I'm still not done reading Cosima, God of the Voyage (I'm on chapter 2, the language is a bit dense) these cards are ones I do like both sides of