Altar of the Lost | Magic: The Gathering
Formats Altar of the Lost is Legal in
Official Oracle Text for Altar of the Lost
: Add two mana in any combination of colors to your mana pool. Spend this mana only to cast spells with flashback from a graveyard.
Official Rulings for Altar of the Lost
1/22/2011 : You can spend mana produced by Altar of the Lost to cast any spell with flashback that you cast from a graveyard. You don't have to be using flashback to cast that spell, however, as long as something else is allowing you to cast that spell.