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
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
And even though it struggles against Orzhov Blink, that deck appears to be fading from the spotlight, leaving Dimir Murktide well-positioned all around
Both sides of the MDFC work well together
And since Boromir is three mana, you can even get him back with Sun Titan triggersI mean, who doesnt want to grind value with Sun Titan triggers
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