Green/Black is a typical midrange deck with good removal and creatures, so you dont have to focus too much on synergy
As for legends in need of a reprint, Leovold, Emissary of Trest could end up representing for Conspiracy 2 but their are a plethora of potential alternatives
If you cast something like a False Mourning or Salvage targeting a Suspend Spell, with at least one remaining in your deck, you can cycle through these effects a number of times
While true, it's actually easier to do with mash and riffle shuffles
Back to testing for the invitational remember to cheer on the Hareruya Pros
Overall, Heidegger, Shinra Executive is an expensive and slow card to play, and can really stagger progress during gameplay , even if its abilities seem positive, making it inapt to work in this particular Magic: The Gathering Final Fantasy set