Thats well worth the 3-mana impending cost
Serialized cards always have a good premium over non-serialized versions, but the actual value varies
We dont have specific price data on the foils you can open (TCG has these cards as Presale until October, which severely limits who can sell on that platform.) but again, these are some very chase cards and we have the example of Time Spiral Remastered to see what can happen with a low drop rate
Not only that, but if you have Scar in play, whenever one of your characters Challenges a damaged character, you can draw a card
Thats already a lot harder to get, as each of the other mythics are at most 187 packs
They can also send people hurling through time, which is put into the game via tucking creatures it would damage away into the library