While it's true that this opens you up to potential blowouts when they wipe the yard with cards like Bojuka Bog or Tormod's Crypt, remember that we're going to be drawing extra cards, too, and we'll be putting cards into the graveyard on most turns, meaning we can recover from a Bog (or Draugr Necromancer) fairly quickly
The deck then adds a number of spells with strong artifact synergy including card draw (Losheel), +1/+1 counters (Steel Overseer), burn (Ingenious Artillerist), direct damage (Mayhem Devil), drain (Mirkwood Bats, Nadier's Nightblade), and more
The reason for the jump seems to be Premodern, where some builds of Survival of the Fittest play the two-drop as repeatable removal that can be tutored up when the time is right
A land that taps for two is usually pretty broken so why not have a land that taps for at least three times that