With some ways to manipulate the top of your library and plenty of cheap cards to cast, you can often win the game the turn you get Bolass Citadel into play
I would personally be incredibly sad at the removal of this deck from the format, even with later, fairer options
The fact that replaces itself at instant speed means you can cycle it when its not needed, for just two mana
JTMS has a 0 ability that is a repeatable Brainstorm , and the +2 ability can break the back of most combo decks
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Contrasting with his later Opus 14 card, which is animated instead of CG