
Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.
Damping Matrix has 2 printings, first in Mirrodin (2003). EDHREC ranks it #15,738 among Commander cards. It appears most in Jasmine Boreal of the Seven decks (1,739 on EDHREC). It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.