
Activated abilities of creatures cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.
Heartstone has 4 printings, first in Stronghold (1998). EDHREC ranks it #3,879 among Commander cards. It appears most in Grenzo, Dungeon Warden decks (3,796 on EDHREC). It has 5 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.