It seems the developers have gone out of their way to prevent even the smallest exploits, making the feature feel more like a burden than a benefit
Like the other meld cards, Gaea Incarnate is a massive threat that can win games on her own, potentially on the turn she enters play
And then there were the other color pairs, with a smattering of common Creature types but far less synergy: Faeries, Treefolk, and Giants
The way in which you reach chapters is by adding or subtracting lore counters to the Saga, which automatically happens upon entering the battlefield or after the draw step
Economy options like USPS First Class International offer the most affordable rates for lightweight shipments
Decks that want to draw cards with Fact or Fiction are very unlikely to also be able to optimally use a Skullclamp, decks that have the mana to bust out a five or more mana draw spell are similarly unlikely to also want to use the economic but slow Ancestral Visions