Heartstone
The List (PLST #STH-134)
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CKCard Kingdom
Normal
$2.99
CMCardmarket
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€1.98
MPMana Pool
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$1.66
TCTCGplayer
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$1.88
Heartstone
CMC: 3
Type
Artifact
Rules Text
Activated abilities of creatures cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana.
Printing
The List (PLST #STH-134)
uncommon
Illustrated by John Matson