If a zone is not specified by the effect, the Game Object will be created to the appropriate zone for its type. Permanents will be Created to any location on the Board that they can be played to. 1. Spells will be Created to the Chain. 2. Runes will be Created to base. 3. Legends will be Created to the Legend Zone. 4. Battlefields will be Created to the Battlefield Zone.
§ 439.2.b Core Rules PDF (officieel)
§ 439 Create
§ 439.2 Effects that Create one or more Game Objects will direct where those Game Objects must go - the Game Objects are Created directly to the zones in question.