If you're curious about the story of Bloomburrow and Mabel's quest to defend her family, you can check out the story right here on DailyMTG
It has haste.) Whenever you remove a time counter from this card while it's exiled, surveil 1
If no Goblins have entered the battlefield this turn, no damage will be dealt
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
To cast either one costs you one card out of your hand
However, in regards to Pokemon TCG Live, TPCi announced: Backwards compatibility plans are ongoing, and phased support for additional Expanded format cards is expected to begin later this year