After those cards, these are the other upgrades I recommend: Lands: Arcane Lighthouse, Flamekin Village, Clifftop Retreat, Glacial Fortress, Sulfur Falls, Hallowed Fountain, Tundra, Steam Vents, Volcanic Island, Sacred Foundry, Plateau, Fetchlands Ramp: Solemn Simulacrum, Chromatic Lantern, Coalition Relic Tutors: Mystical Tutor, Enlightened Tutor, Weathered Wayfarer, Tithe, Land Tax Removal: Cyclonic Rift, Path to Exile, Containment Priest, Austere Command Utility: Clever Impersonator, Phyrexian Metamorph, Snapcaster Mage Win Conditions: Ulamog, the Infinite Gyre, Kozilek, Butcher of Truth (if you're running Lightning Greaves, Swiftfoot Boots, and Flamekin Village as you should be) Special Bonus: I'm often asked for an upgraded list, so here's my personal cardboard list that I play at local tables
Bloodsoaked Insight / Sanguine Morass I love me a cost-reduced card
If you are familiar with all the more complex mechanics of YuGiOh (in which case why are you reading this?) then you cannot go wrong with the Synchro of Unity deck, which has the most potential of the three
The popular Welder-based variant is still looking like a top contender, and in addition, a new variant that uses Malamar for Energy acceleration has been receiving a lot of attention