All credit to Hexxen where this decklist was largely drawn from. You can see his original (and more budget deck here https://eternalwarcry.com/decks/d/CpM-CMPlcME/budget-ancient-technology).
With some more shiftstone I would look towards adding
Sandstorm Titan and or
Moonstone Vanguard.
This deck can work well in a decent variety of matchups, being more aggro or switching to more control-based depending on your opponents' actions. I completed my climb through gold to diamond on this deck so while it probably isn't a top-tier deck it is decent.
Also, it risks a blowout but
Ancient Defenses and dropping 3-4 big bond titans in one turn can cause people to just fold.
Char
x3
1
Opum's Technique
x1
2
Coretap Maximizer
x4
2
Powercell
x4
3
Ancient Defenses
x4
3
Coveted Gemstone
x4
3
Laser Blast
x4
3
Wilderness Refuge
x2
4
Monolith Guardian
x3
4
Redplate Crasher
x3
4
Shoal Custodian
x4
5
Infused Guardian
x2
5
Moonstone Vanguard
x2
6
Tempered Sentinel
x4
9
Scourstone Sentinel
x4
Fire Sigil
x6
Time Sigil
x6
Common Cause
x1
Praxis Insignia
x4
Praxis Painting
x4
Rune of Flame
x1
Rune of Relocation
x1
Seat of Impulse
x4
View Deck on Shiftstoned