Journey to Eternity: Enchant creature you control
When enchanted creature dies, return it to the battlefield under your control, then return Journey to Eternity to the battlefield transformed under your control.
 
Atzal, Cave of EternityCard: (Transforms from Journey to Eternity.)
Tap: Add one mana of any color to your mana pool.
3BG, Tap: Return target creature card from your graveyard to the battlefield.