Being able to play lands directly from your graveyard has empowered quite a few strategies in Magic, most notably Legacy Lands and Vintage Workshop, but you'll occasionally see it in Modern Golgari decks too
Ulamog, the Ceaseless Hunger Ulamog, the Ceaseless Hunger is basically the Galactus of Magic
Chromium, the Mutable is such a card
Elvish Archdruid Marywn, the Nurturer Wood Elves Rhys the Exiled Beast Whisperer Wirewood Channeler Elvish Promenade Casualties of War Sol Ring Arcane Signet These reprints alone come close to the price of admission, and when you add on the value of some of the new cards anywhere from $8-18 a piece you end up with a deck thats seriously good value for your money
Multiple hourglasses can be used to reduce the waiting time further, but once a pack is opened, it will go back to 12 hours
Rite of Replication or Myojin of Cryptic Dreams can get you there unconditionally in one card, while Echoing Equation and Mirrorweave are more battlefield-dependent