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Q: I'm a little confused. What cards are eligible to appear in Modern Masters?
A: Cards from core sets and expert expansions legal in the Modern format are eligible, but Modern Masters only includes those from Eighth Edition up through Alara Reborn. Specifically, here is the list of all the sets that might have cards in Modern Masters:
Champions of Kamigawa
Betrayers of Kamigawa
Saviors of Kamigawa
Ravnica: City of Guilds
Shards of Alara