expand_less Tier 0: Nothing (no (no published class is this powerful, but theysome builds can be with certain options like the Incantatrix or infinite power point Spell-to-Power Erudite abuse).
Tier 0.5:  Erudite (Spell to Power variant)variant), Psionic Artificer
Tier 1: Archivist, Artificer, Cleric, Druid, Wizard
Tier 1.5: Cleric (Spontaneous), Death Master, Druid (Spontaneous,(Spontaneous), Urban), Erudite, Evangelist, Shaman, Sha'ir, Spirit Shaman, Psion, Urban Druid (not the ACF), Wu Jen
Tier 2: Binder (w/ Zceryll vestige), Favored Soul, Sorcerer, Truenamer (w/ inifinteinfinite summoning)
Tier 2.5: Ardent, Beguiler, Dread Necromancer, Factotum (w/ Font of Inspiration), Mystic, Shugenja, Wilder, 
Tier 3: Bard, Binder, Crusader, Jester, Swordsage, PsychicWarblade, Warlock, Warmage, Psychic Warrior, Incarnate,Ranger Totemist,(Mystic), Wilder,Spellthief Ardent, (trickster), Swordsage, Warblade, Warmage
Tier 3.5: Dread Necromancer, Dragonfire Adept, Duskblade, Factotum, Healer,Healer, Incarnate, Nightstalker, Psychic Rogue (with powers), Ranger (Wild Shape), Shadowcaster, Totemist, Warlock, 
Tier 4: Adept, Barbarian, Barbarian, Fighter (Dungeon Crasher), Paladin, Ranger, Rogue, Scout, Shadowcaster, Spelltheif, Scout, Spellthief, 
Tier 4.5: Divine Mind,Mind, Dragon Shaman, Fighter, Hexblade,Hexblade, Lurk, Marshal, Monk, Ninja, Savant, Sohei, Soulknife, Truenamer
Tier 5: Battle Dancer, DragonKnight, Shaman,Noble, Master, Magewright, Mariner, Mountebank, Samurai (OA, CW w/ Imperious Command),,  Soulknife, Swashbuckler, Knight, Soulborn, Eidolon,Swashbuckler,   Lurk, Noble, Master, Magewright, Mariner
Tier 5.5: Samurai (CW), Expert, 
Tier 6: Aristocraft, Aristocrat, Commoner, Warrior, 
Others: Eidolon, Eidoloncer, Mlar