Need cards for my Zombie Aggro deck!!!!!

I am almost done with my modern Zombie Aggro deck, but I need just a few cards.

Cards I need...
- 1 Gatekeeper of Malakir
- 2 Erebos, God of the Dead
- 1 Nykthos
- 1 Extirpate

Feel free to browse through my tradelist
https://deckbox.org/sets/270369?s=j&o=d