Dihada has two main abilities that make your legendary deck stronger
Imperial Recruiter is easy enough to find for about $30 today, and while the card sees less play in Legacy than Tabernacle does, its not by much
Getting Belle out early can help you accelerate to ten ink quickly, which will also allow you to play cards like Hades, Infernal Schemer and Robin Hood, Unrivaled Archer
We just lost Quick Ball [Sword and Shield] to rotation, so that means we need to find a way to replace it
So if you gave an opponent five rad counters, they will mill 10 cards, and there's a chance nine were nonlands, causing more life loss than counters, then a loss of nine rad counters (or all five in this example)