It will trigger on every player's upkeep, and each player will make a number of 2/2 Black Zombie creature tokens equal to the number of creature cards in their graveyard
It does what it needs to do very well, and being able to only leave one mana up and destroy any creature is something that most decks can do comfortably
With their short little arms, big bitey faces, and devastating stats, we can definitely see why
(6/6/2025) A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way
Spectacular Specters, on the other hand, features a larger number of the new Whispers and therefore is designed to exploit their Boost mechanics to the fullest
Copy Argentum Armor