THIS, contrary to popular belief is not it
Traditionally, the average value of a rare in a Masters set is somewhere around $5.50, and even the fetch-land-reprinting Modern Masters 2017 only came in at $5.91
While there are some other phenomenal options, these are the ones I think are most universally good, and will help be the glue in your decks
(For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter.) Storm (When you cast this spell, copy it for each spell cast before it this turn.) The copies are put directly onto the stack
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Latias ex #239 Special Illustration Rare Latias ex #239 Special Illustration Rare is currently the second most expensive card from Surging Sparks