We do face that now-recurring issue of our strongest cards wanting to play at different speeds
Her favorite cards are Mirari and Phyrexian Arena, and she loves any and all old border foils
As a result, were going to focus on examples that are either historically good investments or have potential at date of publication (August 2023)
Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent." Even if all you do is cast two of these in a row, you'll suddenly have a 13/13 and an 8/8 dragon if every exiled card was an instant or a sorcery
You actually must include art of some kind to save your work, and the pic you plan to use must be in your photos already (you cant exit, use the AI art generator, and come back, for example)
The Mastery track usually runs for the duration of the set release cycle, around 8-12 weeks from launch.