Choco provides you card selection, ramp, and graveyard setup, making for the best Chocobo card in Magic's Final Fantasy set
Suddenly your Leyline Bindings are answering two permanents, your evoke Elementals become super-charged double triggering when they enter the battlefield, your Fable of the Mirror-Breaker is making double the Goblin tokens, and this isnt even considering the possibility of actually building around Elesh Norn in some sort of ETB heavy Soulherder or Ephemerate blink shell
And of course, Spellseeker is one of the most valuable setup creatures you can run: It tutors up any key instant or sorcery with mana value 2 or less, often grabbing interaction like Swan Song or combo pieces like Demonic Consultation
While Gideon may not survive said attack, it can be a solid means of buying you much-needed time
Thats a ton of value and pressure, and it only ramps up from there
Piece of cake