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Combined with the frankly outrageous state of things back then (4 Ancestral Recall , anyone?) leading to prolonged game states and impasses, WotC decided that enough was enough and restricted Ivory Tower

Fabled Passage isnt enough, but we may see it as a pillar of Pioneer at one point

There are no doubt decks like Jared Cathalion that enjoy the fact everything is a rainbow, but the mana fixing part probably isnt enough to run this thing on its own

2008-04-01 Although Tariff checks the converted mana cost of the creatures on the battlefield, you need to pay the creature's actual mana cost (including color) to keep it on the battlefield.