Anyway, lets say it was 50%, that still means that opt is 75% of the effect of Preordain, an established top end card quality spell
But other than that, Dovin Baan is about drawing cards
Since we're playing an already okay two-drop with Naban, Dean of Iteration, we can get away with playing a few really good enters-the-battlefield Wizards and filling the rest of our deck with other cards and still have Naban, Dean of Iteration be worthwhile
I have very few cards left that were worn by unsleeved play from back in the 90s
he's a ridiculously good toolbox commander
A deck focused on resource denial and graveyard manipulation, such as a control or discard deck, could benefit from Gravestorm as it provides card advantage while potentially disrupting the opponent's graveyard strategy