
Whenever one or more creatures you control deal combat damage to a player, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
{1}{G}, Exile a creature card from your graveyard: Investigate. You gain 2 life.
Ongoing Investigation has 3 printings, first in Shadows over Innistrad (2016). EDHREC ranks it #10,491 among Commander cards. It appears most in Morska, Undersea Sleuth decks (3,685 on EDHREC). 1 public deck on TCG runs it. It has 4 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.