Improving the Treasure Engine

Potential Cuts:
Smuggler's Share and Monologue Tax — These rely entirely on your opponents' actions, which can whiff.
Rain of Riches and Rose Room Treasurer —Slow
Thopter Engineer and Solemn Simulacrum — Sluggish and low-impact.

Potential Adds:
Black Market Connections — Fast, entirely self-reliant treasure generation that comes down early.
Xorn — Multiplies treasures
Professional Face-Breaker — turns Treasure into impulsive card draw.
Magda, Brazen Outlaw — turns your tapped Constructs into treasures
Pitiless Plunderer — Aristocrats payoff.

Optimizing Synergy and Recursion

Potential Cuts:
Trading Post and Hangarback Walker — mana-intensive

Potential Adds:
Goblin Engineer — Cheap artifact recursion.
Blind Obedience — stops opponents' fast mana (treasures, fetchlands, mana rocks) and gives an Extort mana-sink.
Thousand-Year Elixir — Allows Jan to tap the very turn he comes down.
Tocasia's Welcome — Free Draw

Upgrading the Mana Base

Potential Cuts:
Tainted Field
Tainted Peak
Shadowblood Ridge
Shattered Landscape

Potential Adds:
City of Brass
Spectator Seating
Luxury Suite
Vault of Champions