As for me, if I see a card that can singlehandedly warp the game, sign me up immediately
Notably, there are two variants for this particular deck: the battlecruiser version that isnt really running win conditions outside of draw engines, and the self-mill version that wants to win with Thassas Oracle using various milling effects from Adventure spells
She can protect herself with her -3 loyalty ability, but it requires that your graveyard is already filled with a handful of cards
You have a healthy amount of basics, so theres minimal concern of running into Ruination or Blood Moon
Sadly, because it is five mana and slow to get going, although it is still a great threat, it is not a great life gain card
With these solutions, you still have plenty of product to sell, and plenty of opportunities to bring in new players, without overwhelming the established fan base