Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves.
, , Sacrifice this artifact: You may cast any number of spells from among cards exiled with this artifact with total mana value X or less without paying their mana costs.
, 
, Sacrifice this artifact: You may cast any number of spells from among cards exiled with this artifact with total mana value X or less without paying their mana costs.
