Lone Revenant | Magic: The Gathering
Formats Lone Revenant is Legal in
Official Oracle Text for Lone Revenant
Whenever Lone Revenant deals combat damage to a player, if you control no other creatures, look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
Official Rulings for Lone Revenant
5/1/2012 : If you control Lone Revenant and any other creature (including another Lone Revenant), its ability won't trigger.
5/1/2012 : Check whether Lone Revenant's ability triggers after combat damage is dealt but before any creatures that are destroyed due to combat damage leave the battlefield. For example, if you control Lone Revenant and another creature, and that other creature takes lethal damage in the same combat damage step that Lone Revenant deals damage to a player, Lone Revenant's ability won't trigger.
5/1/2012 : If you control no creatures when Lone Revenant's ability resolves, you'll still look at the top four cards and put one into your hand.