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: Wizard, Cleric, Druid, Archivist, Artificer, Spell-to-Power Cleric,Erudite, RazmarianDruid, /Erudite False(Spell Priestto /Power Psychicvariant)?, BloodlineWizard
Tier
Sorcerer,1.5: Shaman,Death Arcanist,Master, Erudite, Psion, AnythingSha'ir, withSpirit ParagonShaman Surge, Lunar / Ancient / Lorekeeper Oracle, Psychic, Anything with Augmented Psychic Reformation, Witch
Tier 2: Oracle, Sorcerer, Summoner, Favored Soul, Psion, Binder (w/ allZceryll vestiges),vestige), Eurdite,Favored Soul, Sorcerer, Truenamer (w/ infiniteinifinte summing),summoning), Deathmaster, Mystic, Sha'ir, Spirit Shaman, Wu Jen,Jen
Tier
Magician2.5: Mystic, Bard,Shugenja Monster Tactician Inquisitor, Preservationist Alchemist, Student's Surge / Human FCB Wilder, Taskshaper
Tier 3: Beguiler, Beguiler, Dread Necromancer, Crusader, Bard, Swordsage, Binder (only basic vestiges), Wildshape Ranger, Duskblade, Factotum, Warblade, Psychic Warrior, Alchemist, Skald, Inquisitor, Magus, Investigator, Warpriest, Hunter, Incarnate, Totemist, Wilder, Cryptic, Dread (w/o fear immune enemies), Stalker, Tactitian, Vitalist, Vizier, Warlord (by Dreamscarred), Warder, Ardent, Shugenja,Shugenja, 
Tier
Synthesist 3.5: Summoner, Guru, Sacred Servant Paladin, Mesmerist, Occultist (both versions), Spiritualist, Monstrous Physique Bloodrager, Spirit Dancer Medium, Warlock / Zealot Vigilante, Gifted Blade Soulknife, Harbinger
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)