Mana rocks in particular are often also ways to fix your mana (get access to different colors) since they produce colored mana but usually only cost generic mana to play
or they sit around the battlefield, close to lands, unattached to any card in particular, but affecting the game in some way for you
While not as oppressive or powerful as Sliver Queen or Sliver Overlord, it plays an exciting game nonetheless with options to be built competitively or casually
Granted, you do have to exile some as a cost and the free card is saddled with a Finality counter
After a little deliberation, the Charles Urbach Plains from M12 was the homerun choice for my Lyra Dawnbringer deck
Of particular note, Karn, the Great Creator shuts down opposing artifacts