Heartstone

Artifact    (CMC:3)

The cost of each creature ability requiring an activation cost is reduced by . This cannot reduce an ability's generic mana cost to less then .

"Finding a true heartstone is even harder than finding a true heart." —Hanna

ST • ENJohn Matson

™ & © 1993—1998 Wizards of the Coast

Legal in: Tempest Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Heartstone {3} Artifact 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.

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View this MTG card on Gatherer

10/4/2004
The cost reduction can be applied to additional costs.
10/4/2004
It will not add a  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.
7/1/2013
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder texts.

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Card Heartstone is not on TCGPlayer.