Rod of Absorption [Dungeons & Dragons: Adventures in the Forgotten Realms Commander]

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Commander Type: Artifact Rarity: Rare Cost: {2}{U} Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves.{X}, {T}, Sacrifice Rod of Absorption: You may cast any number of spells from among cards exiled with Rod of Absorption with total mana value X or less without paying their mana costs.