This process of expanding requires you to fill up your treasury so you can hire minions, reinforce your castle, and build new buildings
For example, here are some of the earliest: Auriok Steelshaper was a generic 1/1 for 2 mana on its own, and if it was equipped, only Soldiers and Knights would get a bonus, and it was just +1/+1
This green, white, and blue deck is just loaded with all the best cards you can find

Nekusar, the Mindrazer Nekusar, the Mindrazer | Illustration by Mark Riddick Commander (1) Planeswalker (4) Ashiok, Dream Render Jace Beleren Ob Nixilis Reignited Ob Nixilis, the Hate-Twisted Creature (19) Bone Miser Scrawling Crawler Razorkin Needlehead Elder Brain Fate Unraveler Fell Specter Goblin Electromancer Kami of the Crescent Moon Kess, Dissident Mage Magus of the Jar Nightscape Familiar Niv-Mizzet, Parun Niv-Mizzet, the Firemind Obosh, the Preypiercer Sheoldred, the Apocalypse Stormfist Crusader Tergrid, God of Fright The Locust God Vito, Thorn of the Dusk Rose Instant (11) Aetherize Bedevil Brainstorm Counterspell Crosis's Charm Dark Ritual Negate Perplex Rakdos Charm Terminate Vision Skeins Sorcery (11) Collective Defiance Cruel Ultimatum Dark Deal Deadly Tempest Diminishing Returns Game Plan Khorvath's Fury Peer into the Abyss Prosperity Wheel of Misfortune Whispering Madness Enchantment (8) Curse of Obsession Megrim Phyrexian Tyranny Raiders' Wake Spiteful Visions Underworld Dreams Well of Ideas Wizard Class Artifact (9) Arcane Signet Decanter of Endless Water Folio of Fancies Geth's Grimoire Mind Stone Relic of Sauron Otherworld Atlas Sol Ring Teferi's Puzzle Box Land (37) Seething Landscape Bojuka Bog Command Tower Crumbling Necropolis Thundering Falls Geier Reach Sanitarium Island x7 Maestros Theater Mountain x6 Myriad Landscape Smoldering Marsh Sunken Hollow Swamp x12 Xander's Lounge Undercity Sewers One of my first 3-color decks ever was Nekusar, the Mindrazer
