Heartstone - The List Tweet Brand New, 1 In stock $3.19 Details Artist: John Matson Card Number: 134/143 Card Text: Creatures' activated abilities cost 1 less to play. If this would make an ability cost 0 or less mana to play, it costs 1, plus any nonmana costs. Card Type: Artifact Color: Artifact Cost: 3 Finish: Regular Name: Heartstone Rarity: U Set Name: The List - Stronghold