Pierrecoeur (Heartstone) (fr)
Artifact (CMC 3)
Activated abilities of creatures cost
less to activate. This effect can't reduce the mana in that cost to less than one mana.
Decks with Heartstone
[PLIST] The List #1333 (U)
[STH] Stronghold #134 (U)
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[H09] Premium Deck Series: Slivers #26 (U)