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
How many Pack Points does it cost to craft Nuzleaf
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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
Kastral ignores the concept of feather counters and instead deals in +1/+1 and finality counters
On top of that, it has a three-Energy attack called Eon Blade that deals 200 damage, but it makes Latias Ex incapacitated to attack on the next turn