Waiting to gain life from Wall of Reverence, another end of turn trigger, wont work because we have to choose the target when we put Celestines ability on the stack
The type-changing ability that can make Purphoros not be a creature functions only on the battlefield
If that didnt convince you, maybe the ability on Hellkite Overlord will
Stitch - Rock Star[card] allows you to keep the board filled with threats which refilling your hand, giving you great resilience to sweepers like [card]Grab Your Swords or Be Prepared
Gameplay Specifics Revisited Pace Final Fantasy is not an especially fast set
MTG x Avatar Prerelease Guide: New Mechanics, Archetypes, and Top Picks from Magic: The Gathering | Avatar: The Last Airbender With Avatar: The Last Airbender on our doorstep, my hope is to outline how to properly tackle this set during the Prerelease