This deck is designed exclusively to kill the Eldrazi menace, packed with 18 pieces of mainboard hate along with t1 deathtouchers to slow down the onslought of colorless spaghetti suffering.
The Silver Bullets
Blood Moon & Magus of the Moon
Eldrazi isn't much of a deck without it's ancient temples: Eye of Ugin and Eldrazi Temple. Blood Moon not only instantly stone rains their best mana acceleration, it also will frequently color screw them off playing big threads like thought-knot seer and Reality Smasher. Moon also has the added benefit of color screwing 75% of decks in the format.
Ensnaring Bridge
If they can't attack you, they can't win. This is a huge annoyance for tons of decks in the format, and is a definite 4 of.
Hornet Nest
This is one of the reasons to go green in eldrazi hate skred. No one wants to attack into this thing, and it can stop your opponent for turn after turn while they wait to get a profitable swing larger than a 2/1. I'd go so far as to call it a soft lock, in many situations.
The Deathtouchers
Another big reason to go green. The issue with other Eldrazi hate decks like Boros Skred is that they have to wait until turn 3 to play their silver bullets, by which time your opponent has already got the chance to dump their hand and slam you for 10 or even 15 damage. These tank spikes buy you the time to find and play your hard locks.
Probe & faithless looting
Dig through your deck to find your locks.
Simian Spirit Guide
Turn 2 vs. Turn 3 is a big distinction against your wiggly rivals, and being able to dump a blood moon after your opponent has only 1 turn to play relevant spells is a big edge.
Lightning Bolt
https://www.youtube.com/watch?v=aU4pyiB-kq0
3 is the magic number baby. Lightning bolt is too good not to run even in the most focused decks.