With Heliod, Sun-Crowned, you get all sorts of combos at your disposal
That means that if youve got a strategy in mind, youll likely be able to find at least one that fits into what you want
A creature entering the battlefield or dying at the same time as Hushbringer (including Hushbringer itself entering or dying) won't cause abilities to trigger
Set Design, working with Creative, made a series of creatures that represent different types of fears, all with the creature type Nightmare
Obviously having three modes offsets the latter of these problems somewhat but it does all result in a card that doesn't get a much play as its power level merits
Its true power arrives once you pay 6B and sacrifice a creature to harness it, unlocking an upkeep trigger that reanimates a creature from your graveyard every turn