It adds an extra counter whenever you place one on a creature, planeswalker, or even yourself
If Colonel Autumn isn't on the battlefield as an exploit ability of a creature you control resolves, Colonel Autumn's last ability won't trigger
To explain this oddity, Rhystic Study has been reprinted a large amount, most recently in Jumpstart, a Secret Lair drop, and Jumpstart 2022
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P/T Set Number 348 Language Italiano Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) The token copies exactly what was printed on the original card and nothing else
Deserts Due, Shoot the Sheriff, Murder, and Tyrants Scorn are good, efficient examples
