For high-value cards, buy already-slabbed copies from PSA, BGS, or CGC where the card has been professionally authenticated
These will likely be ex Pokemon with big, splashy abilities or lots of utility to make use of
The thing that makes spree cards unique in terms of modal spells is that the card does nothing unless you pay an additional cost
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While this format has Training, which this can help with, the last format had Coven, which this could have helped with, and it still wasnt a card you ran very often
The idea is to get a card into play and have an immediate effect, then exit and come back later