All promos are available while supplies last
This article on balance highlights the returns of other risky investment options over 10, 5, and 3-year periods
These cards earn Lore needed to win the game based on the number of symbols
(Treat them and anything attached to them as though they don't exist until your next turn.) Any number of target nonland permanents you control phase out
Your creatures are going to be sacrificed left and right so youll have lots of opportunities to do this. Shes a survivor, too: at any time, you can sacrifice a creature and pay one mana to make her indestructible until the end of the turn, like shes using its corpse as a shield
There are extra incentives beyond this for repeat pre-release goers, like a velvet dice bag for second-time pre-releasers, but the d10 is a huge question mark right now