Just between you and me, there have been more wrong Fact or Fiction splits in Magic history than correct ones
For starters, getting a one-mana discount on each of the Party creature types is fantastic
Swing into the season with a full web of event opportunities
5 Karn, Silver Golem (From the Vault: Relics) Of the three Karn, Silver Golem printings, the From the Vault: Relics one is the cheapest version
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Darkness Crystal's first ability)
It also has Eminence, which means that as long as its in the command zone or on the battlefield, itll make dragon spells you cast cost one less to cast