Unsealed spellbook is good because it reduces flash CD by 25%
It doesn't need extra bullshit power like revive or clarity when I know you can't properly evaluate the power of these changes. Just leave it the fuck alone and worry about your other keystones that are either total shit or being abused by 50% of the cast. How you have time to meddle with this stuff when you pretend constantly you don't have the time to make actual meaningful changes to your broken as fuck game is beyond me.
God I already see the stupid low elo comments on reddit saying spellbook is terrible and adding revive WILL MAKE IT SO FUN OMG is this why it's happening, fucking shit dog