Artifact, 3 (3)
Uncommon
Activated abilities of creatures cost {1} less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
"Finding a true heartstone is even harder than finding a true heart."
—Hanna
Illus. John Matson

10/4/2004: The cost reduction can be applied to additional costs.
10/4/2004: It will not add a {1} to abilities with no generic mana in their activation cost.
10/4/2004: It will never reduce any colored mana portion of an activation cost.
7/15/2006: Can’t reduce Snow mana costs.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander