The restriction on Heartstone means that the effect can't reduce the mana portion of the activation cost to nothing, if the cost has a mana portion. It only affects activation costs like "1" or "1, T", but not "W" or "1W", which have the same effect by Heartstone whether or not the restriction exists.
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Was wondering whether heartstone reduced jenara, asura of war's ability.
Does the limit mean 1 mana as in W or 1 colorless mana in addition to any coloured mana.?
Standard- Esper Control
Commander- Mishra, Artificer Prodigy
Intet, the Dreamer
Jhoira of the Ghitu