Sellers are generating revenue not by finding old cards, but by printing new, unique ones
The Earth King is at its best when you can curve a cheap 4-power creature into it, perhaps Surrak, Elusive Hunter in Standard
That same card's mana value becomes a combat buff for one of your creatures
Varina, Lich Queen is really the dark horse of the deck in my opinion
Its very much a control deck looking to answer opposing threats while bleeding away at opponents with the commander, Y'shtola, Night's Blessed
Making sure to support Celes with plenty of creatures, along with any cards that have graveyard effects, makes the most of her ability to buff creatures played from the graveyard with +1/+1, quickly stacking the board with more attackers than your opponents might be equipped to deal with