It's huge
They don't get to play them immediately, preventing Enigma Ridges from destroying a player's advantage
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
So, scroll down, and lets get started