Archangel Avacyn seems like an obvious addition, since it does everything, and Oath of Nissa is going to complement Gideon Ally of Zendikar, the most powerful card, by finding it and helping cast it
First, thanks to its Poke-Body, Dark and Clear, if Suicune ex has a Darkness Energy attached, it becomes immune to Special Conditionsno more annoying status surprises
In addition to tapping for two mana of any color, Gold-Forge Garrison can also tap to make a 4/4 golem creature token
The result of this interaction was previously unintuitive to many players: since that Saga had no chapter abilities, the game defined the "greatest number among its chapter abilities" as zero, and no matter how many lore counters that Saga had on it, it would be sacrificed as a state-based action once it wasn't the source of a chapter ability on the stack (usually right away)
The maximum value of this card would be to discard it for the plainscycling ability early, which keeps you on-curve while you hope to reanimate it later