You can use Sephiroth's ability to stack counters, then sacrifice Aerith when the moment is right to give Sephiroth a significant power boost
With Collector Boosters, your players get direct access to the coolest cards from the set, with each booster packed with special treatments
Sure, every now and then youll go big on a single creature with a massive payoff like Boneyard Lurker or Auspicious Starrix, but a good Mutate player focuses on what they need to do to win the current game, rather than what will make the coolest story
Lastly, in more competitive news, Pro Tour Final Fantasy opened with a staggering 42% of the meta on Izzet Prowessand if you include Red Aggro variants, over half the field was built around Monstrous Rage
Sure, East Tree lets you put a permanent down for free, but that's a win-more card