They can be in card sleeves if you'd like, but not otherwise modified
Instead, each Aura gives a benefit that scales over time
Modern Horizons 2 , while being newer, contains quite a few powerful cards as well as the distinction of being a premium product with a higher inherent price point
Counting tokens specifically pushes this over the top, allowing you to leverage cards like Selvala, Eager Trailblazer and Hallowed Haunting to have long enough turns to make an Izzet player jealous
I think there are ways to efficiently increase the chances of having a storm count (Nykthos, Shrine to Nyx to generate a ton of mana the turn we want to resolve this, for instance), but since this deck is meant for beginners, Im going to keep the mana base simple