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its indeed spellbook is one copy per turn but not at star hall, starhall is +counter (if you suggesting citadel), +atk, and +add, just destroy it with MST or heavy storm when it has counter (3 is enough) then add exodia with this eff, 3 star hall is +3 i think, first i used citadel, but when i used it, library only can use citadel's counter once per turn even citadel has more than 3 counters after first use(maybe bug, and i've deleted my replay, i'll test it again and post the replay if i has same problem again), so i changed with tower, i'll test what your suggest tho, coz i want improvement (fastest now is 4 turn exo), so why not

the equipped monster gains ATK equal to the sent monster's ATK, until the end of this turn (even if this card leaves the field)

Phyrexian Metamorph is a Commander classic, and its particularly useful here: since its an artifact, it synergizes with all of the payoffs in the deck, and you can tutor it up with Inventors Fair

It refers to the flow of your deck in terms of how many expensive and how many cheap cards you include