Against MUD decks, Trygon can help free up your mana from Sphere effects and whittle down their permanents, as only Steel Hellkite or Duplicant can really stop it
The thought process is "oh, I've been losing to Raffine, Scheming Seer out of Esper or Corpse Appraiser out of Grixis, Zenith Chronicler seems like the perfect card to punish those three-color decks," but the issue with this is not considering how the games actually play out and how those decks are usually Constructed
Getting one at instant speed, along with some damage on top to surprise opponents, is even better
When a saga reaches its final chapter, you sacrifice it as part of the resolution of its final chapter ability
MTG Final Fantasy spoilers and news Here are a few choice cards from across the set