Mind you, Im not a hardcore CCG player, and I dont usually seek these experiences out, but Ive got a few friends who play these games competitively or judge competitions, and I trust their assessment based on the Lorcana starter sets
What affects the value of Fynn, the Fangbearer
Primeval Titan also has a near and dear connection to me, as Valakut Ramp was my first competitive Standard deck back in mid-2010
The result of the coin-flip matters, but Mana Crypt's obviously operating in a completely different space from most other coin-flip cards
For example a new landscape or object for a land or artifact card
Mickey can quest for a tasty three lore, and the 'Glad You're Here!' ability makes your next character three ink cheaper any time the card goes questing