What it does
I'm not aware of "Chapter Master" being an official Magic: The Gathering keyword or ability. It doesn't correspond to any standard mechanic in the game's rules.
You may be thinking of something else. A few possibilities: you might mean Saga chapters (the chapter abilities that trigger as lore counters are added), or a specific card name rather than a keyword. There are also fan-made or custom mechanics that circulate online which aren't part of official Magic.
If you can tell me where you saw "Chapter Master"—a specific card, set, or article—I can help clarify whether it's a real mechanic, a card name, or a misremembered term. I don't want to invent rules for something that doesn't exist, since that would mislead you at the table.
Iconic cards with Chapter Master
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