
You can't cast creature spells.
Grid Monitor has 1 printing, first in Mirrodin (2003). EDHREC ranks it #7,805 among Commander cards. It appears most in Zedruu the Greathearted decks (5,819 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.