Originally, the wording in this Community Letter post left the actual details vague
This just wins the game when you cast it, but 8 mana is a lot, especially in White
While it requires you to track and remember specific things each turn in order to resolve the trigger in the end step, it does remove the need to disrupt the middle of someones turn to announce triggers in the manner required by cards such as Rhystic Study or Smothering Tithe
Bear with me At one particular Modern GP about seven years ago, a dredge player made it to an 8-0 record and the coverage team naturally wanted to see them on camera
However, the decks adopting its use the most (currently) are Temur Rhinos or similar Cascade-oriented decks that can levy it for an edge against matchups with Amulet Titan, Griefblade, Yawgmoth, and other top-tier decks in the format
Its a White-Blue deck built around Isperia, Supreme Judge , and it loves to play the skies, basically, your whole crew flies