Spellslingers can run the problem of lacking a wincon, but Eris being a beater who makes beaters helps us in no short supply
This deck has built-in tools that allow your cheap characters to trade up into more expensive characters, which will in turn allow you to deal with the opponent cheaply and still have ink left to redevelop your board
Emeria Shepherd Just like Platinum Angel, Emeria Shepherd can fly, has four power and toughness, and costs seven mana to cast
Flawless Maneuver, Heroic Intervention, Teferi's Protection etc
A dedicated self-mill deck dumps plenty of its own cards in the graveyard, not to mention splash damage from cards like Mesmeric Orb and Breach the Multiverse that mill your opponents
Seasoned Dungeoneer Dont get me wrong, the main reason Seasoned Dungeoneer is at the top is the initiative mechanic, which is a busted mechanic in many formats