They dont have many cards that matter
The one big, expensive addition to the non-budget build is Cavern of Souls, and while the card is great against control and pretty close to a free roll, since Lead the Stampede is the only non-Elf card in our deck, it's probably not 100% necessary
This four-mana sorcery gives all your creatures not only infect, but also +1/+1 and trample until the end of the turn
Massacre Girl, Known Killer and Syr Konrad, the Grim can abuse all this death to draw cards and obliterate life totals
Ral, Monsoon Mage / Ral, Leyline Prodigy The existence of Ral, Monsoon Mage is exactly why cards like Goblin Electromancer arent staples anymore