expand_less Tier 0: Nothing (no published class is this powerful, but they can be with certain options like the Incantatrix or infinite power point Spell-to-Power Erudite abuse).
Tier 0.5:  
Tier 1: Archivist, Artificer, Cleric, Druid, Erudite (Spell to Power variant)?, Wizard
Tier 1.5: Death Master, Erudite, Psion, Sha'ir, Spirit ShamanShaman, Wu Jen
Tier 2: Binder (w/ Zceryll vestige), Favored Soul, Sorcerer, Truenamer (w/ inifinte summoning),summoning) Wu Jen
Tier 2.5: Mystic, Shugenja
Tier 3: Beguiler, Dread Necromancer, Crusader, Bard, Swordsage, Binder (only basic vestiges), Wildshape Ranger, Duskblade, Factotum, Warblade, Psychic Warrior, Incarnate, Totemist, Wilder, Ardent, Shugenja, 
Tier 3.5: 
Tier 4: Rogue, PF Ninja, Barbarian, Warlock, Warmage, Scout, Ranger, Hexblade, Adept, Spelltheif, Marshal, Warlord (by Adamant), Archetyped Fighter, Paladin, Adept, Bloodrager, Slayer, Archetyped Brawler, Archetyped Monk, Pistolero / Musket Master Gunslinger, Aegis, Marksman, Archtyped Soulknife, Dragonfire Adept, Jester, Montebank, Savant, Shadowcaster, Sohei, Daevic, Medium, Vigilante, Kineticist
Tier 4.5: 
Tier 5: Fighter, Monk, CA / Rokugan Ninja, Healer, Swashbuckler (both versions), Soulknife, Expert, OA / CW Samurai (w/ Imperious Command), Knight, Soulborn, Gunslinger, Battledancer, Divine Mind, Dragon Shaman, 3.5 Eidolon, Lurk, Noble, Master, Magewright, Mariner, Mlar, Cavalier
Tier 5.5: 
Tier 6: CW Samurai, Aristocraft, Warrior, Commoner, Truenamer (w/o infinite summoning), Dread (w/ fear immune enemies)