
Whenever a creature with toughness 4 or greater is put into your graveyard from the battlefield, you may exile it.
At the beginning of the end step, if three or more cards have been exiled with this artifact, sacrifice it. If you do, return those cards to the battlefield under their owner's control.
Colfenor's Urn has 2 printings, first in Lorwyn (2007). EDHREC ranks it #6,940 among Commander cards. It appears most in Felothar the Steadfast decks (8,644 on EDHREC). 1 public deck on TCG runs it. It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.