Here is my budget upgrade for the Battle for Zendikar Ultimate Sacrifice Event Deck. What I did was remove all of the Fate Reforged and Khans of Tarkir cards because I want to keep the deck Standard. I replaced them with Magic Origins, Battle for Zendikar and Oath of the Gatewatch cards that I had on-hand. The upgrade cost for this is about $3 with 2 Hissing Quagmires costing about $1 each. Even though I had to take out some pretty great cards, the deck performs much better with 4 Zulaport Cutthroats and 4 Nantuko Husks.

What I took out:
4x Jungle Hollow
2x Murderous Cut
1x Warden of the First Tree
1x Whisperwood Elemental
1x Grim Haruspex
1x Tasigur, The Golden Fang
2x Sultai Emissary
1x Caustic Caterpillar moved to Sideboard
3x Cranial Archive from Sideboard

What I put in:
2x Hissing Quagmire
2x Mortuary Mine
2x Grasp of Darkness or 2x Oblivion Strike
1x Smothering Abomination
1x Brood Butcher
2x Nantuko Husk
3x Zulaport Cutthroat
4x Oblivion Strike in Sideboard