She's already pricey at five mana, and gaining a significant storm count even with a bunch of cantrips will make her effectively a seven or eight-mana card at least
The Shield Sphere gets more and more damaged and loses points off of its toughness as you use it as a blocker, though, which is a nice mechanic as it grows ever smaller
each Collector Booster contains: - 15 Magic: The Gathering cards - Collector Boosters may contain these cards: EOE 1266, 277392
However, accessing those worlds requires purchasing them outside the game
You could also use cards with undying or something like World Shaper to keep yourself ahead
This way, even if you have rad counters and are low on life, you still have some hope to survive to your next turn