It has been supplanted completely by the more flexible Hexproof. "Substance" was a static ability with no effect which was never printed on a "Magic" card. It was originally created for the "" release of "", as a cycle of cards such as Armor of Thorns did not work as originally intended under the rules established with the release of "". These cards were all enchantments that could be played as instants, but only lasted for one turn if played as an instant. Under the newer rules, the original wording would cause the enchantment to leave the battlefield before damage was removed from creatures. The creation of substance restored the cards' intended functionality. With the rule changes announced in July 2009, all cards edited to use this keyword were re-edited to no longer use it. The official text of such cards now reads: "If you cast [this card] any time a sorcery couldn't have been cast, the controller of the permanent sacrifices it at the beginning of the next cleanup step." This maintained the same functionality as the substance keyword, but without some unintended rules quirks.