As long as these permanents are creatures they're eligible to merge with a mutating creature spell
Above all because it hasn't been powercrept: It's still the best wheel effect in the game, and to this day one of Magic's best red sorceries
For example, when we were designing Eventide , two of the major themes were -1/-1 counters and colors matter
The Command Zone created guidelines for players to use before starting a game
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