These cards all feel really weak, while there is obvious synergy you should not be running cards that are worth 4+ mana like Necromantic Thirst simply because in modern you should be looking to win as early as turn 4 or at least have answer to a turn 4 win and Necromantic Thirst would be quite a good card if the game would last for 200 turns but you simply won't get much value out of it and would have better success running an other creature card instead of trying to recur some.
I would suggest to look at UW token that is an archetype that can be fairly budget that look to accomplish similar goals and might be in your playstyle.
Here's what a budget (under or near 100$ deck) could look like:
You can also fit some Soul Warden and Soul's Attendant to gain an impressive amount of life per turn with some Ajani's Pridesmate . Serra Ascendant is also a valid option if you going in the Soul Sister deck, I would also look into Martyr Proc if you want to get into this archetype.
4 Ornithopter
2 Nantuko Husk
2 Ninth Bridge Patrol
2 Countless Gears Renegade
1 Disciple of the Vault
1 Zulaport Cutthroat
1 Elesh Norn, Grand Cenobite
4 Altar's Reap
1 Secure The Wastes
4 Resourceful Return
1 Necromantic Thirst
1 Harsh Sustenance
2 Raise the Alarm
1 Bone Splinters
3 Dictate of Erebos
11 Swamps
-4 Resourceful Return
-1 Necromantic Thirst
-1 Harsh Sustenanceà
-3 Dictate of Erebos
-1 Secure the Wastes
-1 Zulaport Cutthroat
-4 Ornithopter
These cards all feel really weak, while there is obvious synergy you should not be running cards that are worth 4+ mana like Necromantic Thirst simply because in modern you should be looking to win as early as turn 4 or at least have answer to a turn 4 win and Necromantic Thirst would be quite a good card if the game would last for 200 turns but you simply won't get much value out of it and would have better success running an other creature card instead of trying to recur some.
I would suggest to look at UW token that is an archetype that can be fairly budget that look to accomplish similar goals and might be in your playstyle.
Here's what a budget (under or near 100$ deck) could look like:
This is not perfect but should give you a guide line to build your deck, Hidden Stockpile isn't quite good enough for modern.
I would suggest investing in some Discard effect like Thoughtseize and Inquisition of Kozilek (3 of each)
You can also fit some Soul Warden and Soul's Attendant to gain an impressive amount of life per turn with some Ajani's Pridesmate . Serra Ascendant is also a valid option if you going in the Soul Sister deck, I would also look into Martyr Proc if you want to get into this archetype.